21201220202112 has 128 divisors (see below), whose sum is σ = 65866364136000. Its totient is φ = 6695122148352.

The previous prime is 21201220202081. The next prime is 21201220202143. The reversal of 21201220202112 is 21120202210212.

It is a happy number.

21201220202112 is a `hidden beast` number, since 212 + 0 + 1 + 220 + 20 + 211 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (21201220202081) and next prime (21201220202143).

It is a tau number, because it is divible by the number of its divisors (128).

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 161371503 + ... + 161502830.

Almost surely, 2^{21201220202112} is an apocalyptic number.

It is an amenable number.

21201220202112 is an abundant number, since it is smaller than the sum of its proper divisors (44665143933888).

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

21201220202112 is a wasteful number, since it uses less digits than its factorization.

21201220202112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322874375 (or 322874357 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21201220202112 its reverse (21120202210212), we get a palindrome (42321422412324).

The spelling of 21201220202112 in words is "twenty-one trillion, two hundred one billion, two hundred twenty million, two hundred two thousand, one hundred twelve".