21731135442 has 32 divisors (see below), whose sum is σ = 45698057280. Its totient is φ = 6879270720.

The previous prime is 21731135423. The next prime is 21731135453. The reversal of 21731135442 is 24453113712.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 1013088 + ... + 1034315.

It is an arithmetic number, because the mean of its divisors is an integer number (1428064290).

Almost surely, 2^21731135442 is an apocalyptic number.

21731135442 is an abundant number, since it is smaller than the sum of its proper divisors (23966921838).

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

21731135442 is a wasteful number, since it uses less digits than its factorization.

21731135442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2047498.

The product of its digits is 20160, while the sum is 33.

The spelling of 21731135442 in words is "twenty-one billion, seven hundred thirty-one million, one hundred thirty-five thousand, four hundred forty-two".