21351435042 has 32 divisors (see below), whose sum is σ = 48846845952. Its totient is φ = 6094964304.

The previous prime is 21351435023. The next prime is 21351435097. The reversal of 21351435042 is 24053415312.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 179178 + ... + 273509.

It is an arithmetic number, because the mean of its divisors is an integer number (1526463936).

Almost surely, 2^21351435042 is an apocalyptic number.

21351435042 is an abundant number, since it is smaller than the sum of its proper divisors (27495410910).

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

21351435042 is a wasteful number, since it uses less digits than its factorization.

21351435042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 453822.

The product of its (nonzero) digits is 14400, while the sum is 30.

The spelling of 21351435042 in words is "twenty-one billion, three hundred fifty-one million, four hundred thirty-five thousand, forty-two".