101011021220 has 12 divisors (see below), whose sum is σ = 212123144604. Its totient is φ = 40404408480.

The previous prime is 101011021219. The next prime is 101011021229. The reversal of 101011021220 is 22120110101.

It can be written as a sum of positive squares in 2 ways, for example, as 58730614336 + 42280406884 = 242344^2 + 205622^2 .

It is not an unprimeable number, because it can be changed into a prime (101011021229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2525275511 + ... + 2525275550.

It is an arithmetic number, because the mean of its divisors is an integer number (17676928717).

Almost surely, 2^101011021220 is an apocalyptic number.

101011021220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

101011021220 is an abundant number, since it is smaller than the sum of its proper divisors (111112123384).

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

101011021220 is a wasteful number, since it uses less digits than its factorization.

101011021220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5050551070 (or 5050551068 counting only the distinct ones).

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

Adding to 101011021220 its reverse (22120110101), we get a palindrome (123131131321).

The spelling of 101011021220 in words is "one hundred one billion, eleven million, twenty-one thousand, two hundred twenty".