101121021220 has 24 divisors (see below), whose sum is σ = 221586934464. Its totient is φ = 38689781856.

The previous prime is 101121021217. The next prime is 101121021223. The reversal of 101121021220 is 22120121101.

It is an interprime number because it is at equal distance from previous prime (101121021217) and next prime (101121021223).

It is a self number, because there is not a number n which added to its sum of digits gives 101121021220.

It is not an unprimeable number, because it can be changed into a prime (101121021223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 109913694 + ... + 109914613.

It is an arithmetic number, because the mean of its divisors is an integer number (9232788936).

Almost surely, 2^101121021220 is an apocalyptic number.

101121021220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

101121021220 is an abundant number, since it is smaller than the sum of its proper divisors (120465913244).

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

101121021220 is a wasteful number, since it uses less digits than its factorization.

101121021220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219828339 (or 219828337 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 101121021220 its reverse (22120121101), we get a palindrome (123241142321).

The spelling of 101121021220 in words is "one hundred one billion, one hundred twenty-one million, twenty-one thousand, two hundred twenty".