21542431122 has 24 divisors (see below), whose sum is σ = 46684123200. Its totient is φ = 7179447960.

The previous prime is 21542431117. The next prime is 21542431139. The reversal of 21542431122 is 22113424512.

21542431122 is a `hidden beast` number, since 2 + 1 + 542 + 4 + 3 + 112 + 2 = 666.

It is a super-2 number, since 2×21542431122² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13654 + ... + 208017.

It is an arithmetic number, because the mean of its divisors is an integer number (1945171800).

Almost surely, 2^21542431122 is an apocalyptic number.

21542431122 is an abundant number, since it is smaller than the sum of its proper divisors (25141692078).

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

21542431122 is a wasteful number, since it uses less digits than its factorization.

21542431122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227078 (or 227075 counting only the distinct ones).

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

Adding to 21542431122 its reverse (22113424512), we get a palindrome (43655855634).

The spelling of 21542431122 in words is "twenty-one billion, five hundred forty-two million, four hundred thirty-one thousand, one hundred twenty-two".