21036204254 has 32 divisors (see below), whose sum is σ = 35115171840. Its totient is φ = 9385797600.

The previous prime is 21036204247. The next prime is 21036204269. The reversal of 21036204254 is 45240263012.

It is a congruent number.

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, 769187 + ... + 796065.

It is an arithmetic number, because the mean of its divisors is an integer number (1097349120).

Almost surely, 2^21036204254 is an apocalyptic number.

21036204254 is a deficient number, since it is larger than the sum of its proper divisors (14078967586).

21036204254 is a wasteful number, since it uses less digits than its factorization.

21036204254 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27896.

The product of its (nonzero) digits is 11520, while the sum is 29.

Adding to 21036204254 its reverse (45240263012), we get a palindrome (66276467266).

The spelling of 21036204254 in words is "twenty-one billion, thirty-six million, two hundred four thousand, two hundred fifty-four".