31002021230220 has 144 divisors (see below), whose sum is σ = 99598446249120. Its totient is φ = 7778770126848.

The previous prime is 31002021230179. The next prime is 31002021230281. The reversal of 31002021230220 is 2203212020013.

31002021230220 is a `hidden beast` number, since 3 + 10 + 0 + 202 + 1 + 230 + 220 = 666.

It is a super-2 number, since 2×31002021230220² (a number of 28 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 31002021230193 and 31002021230202.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 9812094 + ... + 12580986.

It is an arithmetic number, because the mean of its divisors is an integer number (691655876730).

Almost surely, 2^{31002021230220} is an apocalyptic number.

31002021230220 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31002021230220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49799223124560).

31002021230220 is an abundant number, since it is smaller than the sum of its proper divisors (68596425018900).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31002021230220 is a wasteful number, since it uses less digits than its factorization.

31002021230220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2772584 (or 2772579 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 31002021230220 its reverse (2203212020013), we get a palindrome (33205233250233).

The spelling of 31002021230220 in words is "thirty-one trillion, two billion, twenty-one million, two hundred thirty thousand, two hundred twenty".