21220101212112 has 120 divisors (see below), whose sum is σ = 66536574705120. Its totient is φ = 6256540880640.

The previous prime is 21220101212081. The next prime is 21220101212173. The reversal of 21220101212112 is 21121210102212.

21220101212112 is a `hidden beast` number, since 21 + 220 + 101 + 212 + 112 = 666.

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

It is a congruent number.

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 23 ways as a sum of consecutive naturals, for example, 180975562 + ... + 181092777.

It is an arithmetic number, because the mean of its divisors is an integer number (554471455876).

Almost surely, 2^{21220101212112} is an apocalyptic number.

21220101212112 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21220101212112 is an abundant number, since it is smaller than the sum of its proper divisors (45316473493008).

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

21220101212112 is a wasteful number, since it uses less digits than its factorization.

21220101212112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 362068401 (or 362068392 counting only the distinct ones).

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

Adding to 21220101212112 its reverse (21121210102212), we get a palindrome (42341311314324).

The spelling of 21220101212112 in words is "twenty-one trillion, two hundred twenty billion, one hundred one million, two hundred twelve thousand, one hundred twelve".