20120645421 has 12 divisors (see below), whose sum is σ = 29165854848. Its totient is φ = 13366363464.

The previous prime is 20120645381. The next prime is 20120645453. The reversal of 20120645421 is 12454602102.

20120645421 is a `hidden beast` number, since 2 + 0 + 1 + 206 + 454 + 2 + 1 = 666.

It is not a de Polignac number, because 20120645421 - 2¹⁸ = 20120383277 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20120645471) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 3947325 + ... + 3952418.

It is an arithmetic number, because the mean of its divisors is an integer number (2430487904).

Almost surely, 2^20120645421 is an apocalyptic number.

It is an amenable number.

20120645421 is a deficient number, since it is larger than the sum of its proper divisors (9045209427).

20120645421 is a wasteful number, since it uses less digits than its factorization.

20120645421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7900032 (or 7900029 counting only the distinct ones).

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

The spelling of 20120645421 in words is "twenty billion, one hundred twenty million, six hundred forty-five thousand, four hundred twenty-one".