21204590342 has 16 divisors (see below), whose sum is σ = 34736016672. Its totient is φ = 9648891840.

The previous prime is 21204590177. The next prime is 21204590347. The reversal of 21204590342 is 24309540212.

It is a junction number, because it is equal to n+sod(n) for n = 21204590299 and 21204590308.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21204590347) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5741543 + ... + 5745234.

It is an arithmetic number, because the mean of its divisors is an integer number (2171001042).

Almost surely, 2^21204590342 is an apocalyptic number.

21204590342 is a deficient number, since it is larger than the sum of its proper divisors (13531426330).

21204590342 is a wasteful number, since it uses less digits than its factorization.

21204590342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11486863.

The product of its (nonzero) digits is 17280, while the sum is 32.

The spelling of 21204590342 in words is "twenty-one billion, two hundred four million, five hundred ninety thousand, three hundred forty-two".