21321434042 has 16 divisors (see below), whose sum is σ = 32840009280. Its totient is φ = 10378273152.

The previous prime is 21321434023. The next prime is 21321434129. The reversal of 21321434042 is 24043412312.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 864983 + ... + 889290.

It is an arithmetic number, because the mean of its divisors is an integer number (2052500580).

Almost surely, 2^21321434042 is an apocalyptic number.

21321434042 is a deficient number, since it is larger than the sum of its proper divisors (11518575238).

21321434042 is a wasteful number, since it uses less digits than its factorization.

21321434042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1754437.

The product of its (nonzero) digits is 4608, while the sum is 26.

Adding to 21321434042 its reverse (24043412312), we get a palindrome (45364846354).

The spelling of 21321434042 in words is "twenty-one billion, three hundred twenty-one million, four hundred thirty-four thousand, forty-two".