101221011020 has 24 divisors (see below), whose sum is σ = 213476425344. Its totient is φ = 40314632576.

The previous prime is 101221011013. The next prime is 101221011077. The reversal of 101221011020 is 20110122101.

It is a super-2 number, since 2×101221011020² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 101221010992 and 101221011010.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10855964 + ... + 10865283.

It is an arithmetic number, because the mean of its divisors is an integer number (8894851056).

Almost surely, 2^101221011020 is an apocalyptic number.

101221011020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

101221011020 is an abundant number, since it is smaller than the sum of its proper divisors (112255414324).

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

101221011020 is a wasteful number, since it uses less digits than its factorization.

101221011020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21721489 (or 21721487 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 101221011020 its reverse (20110122101), we get a palindrome (121331133121).

The spelling of 101221011020 in words is "one hundred one billion, two hundred twenty-one million, eleven thousand, twenty".