21020431122342 has 24 divisors (see below), whose sum is σ = 45545275499880. Its totient is φ = 7006655286720.

The previous prime is 21020431122281. The next prime is 21020431122347. The reversal of 21020431122342 is 24322113402012.

21020431122342 is a `hidden beast` number, since 2 + 1 + 0 + 2 + 0 + 4 + 311 + 2 + 2 + 342 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21020431122347) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12086659 + ... + 13715982.

It is an arithmetic number, because the mean of its divisors is an integer number (1897719812495).

Almost surely, 2^{21020431122342} is an apocalyptic number.

21020431122342 is an abundant number, since it is smaller than the sum of its proper divisors (24524844377538).

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

21020431122342 is a wasteful number, since it uses less digits than its factorization.

21020431122342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25847908 (or 25847905 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

Adding to 21020431122342 its reverse (24322113402012), we get a palindrome (45342544524354).

The spelling of 21020431122342 in words is "twenty-one trillion, twenty billion, four hundred thirty-one million, one hundred twenty-two thousand, three hundred forty-two".