101201221020 has 48 divisors (see below), whose sum is σ = 283805591328. Its totient is φ = 26944880640.

The previous prime is 101201221013. The next prime is 101201221049. The reversal of 101201221020 is 20122102101.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 101201220987 and 101201221005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1277209 + ... + 1354128.

It is an arithmetic number, because the mean of its divisors is an integer number (5912616486).

Almost surely, 2^101201221020 is an apocalyptic number.

101201221020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

101201221020 is an abundant number, since it is smaller than the sum of its proper divisors (182604370308).

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

101201221020 is a wasteful number, since it uses less digits than its factorization.

101201221020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2631990 (or 2631988 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 101201221020 its reverse (20122102101), we get a palindrome (121323323121).

The spelling of 101201221020 in words is "one hundred one billion, two hundred one million, two hundred twenty-one thousand, twenty".