20421523220112 has 160 divisors (see below), whose sum is σ = 69152248258560. Its totient is φ = 5646504090240.

The previous prime is 20421523220099. The next prime is 20421523220123. The reversal of 20421523220112 is 21102232512402.

20421523220112 is a `hidden beast` number, since 2 + 0 + 4 + 2 + 1 + 523 + 2 + 20 + 112 = 666.

It is a super-2 number, since 2×20421523220112² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 108828018 + ... + 109015505.

It is an arithmetic number, because the mean of its divisors is an integer number (432201551616).

Almost surely, 2^{20421523220112} is an apocalyptic number.

It is an amenable number.

20421523220112 is an abundant number, since it is smaller than the sum of its proper divisors (48730725038448).

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

20421523220112 is a wasteful number, since it uses less digits than its factorization.

20421523220112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217843578 (or 217843566 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

Adding to 20421523220112 its reverse (21102232512402), we get a palindrome (41523755732514).

The spelling of 20421523220112 in words is "twenty trillion, four hundred twenty-one billion, five hundred twenty-three million, two hundred twenty thousand, one hundred twelve".