21220101122112 has 42 divisors (see below), whose sum is σ = 60823588461038. Its totient is φ = 7073367040512.

The previous prime is 21220101122089. The next prime is 21220101122137. The reversal of 21220101122112 is 21122110102212.

It can be written as a sum of positive squares in only one way, i.e., 15992768817216 + 5227332304896 = 3999096^2 + 2286336^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 18420226093 + ... + 18420227244.

Almost surely, 2^{21220101122112} is an apocalyptic number.

It is an amenable number.

21220101122112 is an abundant number, since it is smaller than the sum of its proper divisors (39603487338926).

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

21220101122112 is a wasteful number, since it uses less digits than its factorization.

21220101122112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36840453355 (or 36840453342 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 21220101122112 its reverse (21122110102212), we get a palindrome (42342211224324).

The spelling of 21220101122112 in words is "twenty-one trillion, two hundred twenty billion, one hundred one million, one hundred twenty-two thousand, one hundred twelve".