20021100231 has 16 divisors (see below), whose sum is σ = 29520529920. Its totient is φ = 11967779520.

The previous prime is 20021100221. The next prime is 20021100247. The reversal of 20021100231 is 13200112002.

It is not a de Polignac number, because 20021100231 - 2⁵ = 20021100199 is a prime.

It is a super-2 number, since 2×20021100231² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021100221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4153071 + ... + 4157888.

It is an arithmetic number, because the mean of its divisors is an integer number (1845033120).

Almost surely, 2^20021100231 is an apocalyptic number.

20021100231 is a deficient number, since it is larger than the sum of its proper divisors (9499429689).

20021100231 is a wasteful number, since it uses less digits than its factorization.

20021100231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8311046.

The product of its (nonzero) digits is 24, while the sum is 12.

Adding to 20021100231 its reverse (13200112002), we get a palindrome (33221212233).

The spelling of 20021100231 in words is "twenty billion, twenty-one million, one hundred thousand, two hundred thirty-one".