21220813434123 has 24 divisors (see below), whose sum is σ = 30763872083568. Its totient is φ = 14095718364672.

The previous prime is 21220813434113. The next prime is 21220813434169. The reversal of 21220813434123 is 32143431802212.

21220813434123 is a `hidden beast` number, since 2 + 1 + 2 + 20 + 81 + 3 + 434 + 123 = 666.

It is not a de Polignac number, because 21220813434123 - 2⁵ = 21220813434091 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21220813434113) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23750211 + ... + 24627507.

It is an arithmetic number, because the mean of its divisors is an integer number (1281828003482).

Almost surely, 2^{21220813434123} is an apocalyptic number.

21220813434123 is a deficient number, since it is larger than the sum of its proper divisors (9543058649445).

21220813434123 is a wasteful number, since it uses less digits than its factorization.

21220813434123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 887083 (or 887080 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 36.

The spelling of 21220813434123 in words is "twenty-one trillion, two hundred twenty billion, eight hundred thirteen million, four hundred thirty-four thousand, one hundred twenty-three".