20421112056 has 32 divisors (see below), whose sum is σ = 51069080400. Its totient is φ = 6804864000.

The previous prime is 20421112027. The next prime is 20421112093. The reversal of 20421112056 is 65021112402.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58195 + ... + 210306.

Almost surely, 2^20421112056 is an apocalyptic number.

It is an amenable number.

20421112056 is an abundant number, since it is smaller than the sum of its proper divisors (30647968344).

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

20421112056 is a wasteful number, since it uses less digits than its factorization.

20421112056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271679 (or 271675 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 24.

Adding to 20421112056 its reverse (65021112402), we get a palindrome (85442224458).

The spelling of 20421112056 in words is "twenty billion, four hundred twenty-one million, one hundred twelve thousand, fifty-six".