21204541005 has 32 divisors (see below), whose sum is σ = 34117685760. Its totient is φ = 11245711680.

The previous prime is 21204540989. The next prime is 21204541013. The reversal of 21204541005 is 50014540212.

It is not a de Polignac number, because 21204541005 - 2⁴ = 21204540989 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4995414 + ... + 4999656.

It is an arithmetic number, because the mean of its divisors is an integer number (1066177680).

Almost surely, 2^21204541005 is an apocalyptic number.

It is an amenable number.

21204541005 is a deficient number, since it is larger than the sum of its proper divisors (12913144755).

21204541005 is a wasteful number, since it uses less digits than its factorization.

21204541005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6041.

The product of its (nonzero) digits is 1600, while the sum is 24.

The spelling of 21204541005 in words is "twenty-one billion, two hundred four million, five hundred forty-one thousand, five".