21311505254 has 32 divisors (see below), whose sum is σ = 35500308480. Its totient is φ = 9533280672.

The previous prime is 21311505233. The next prime is 21311505289. The reversal of 21311505254 is 45250511312.

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, 41207 + ... + 210525.

It is an arithmetic number, because the mean of its divisors is an integer number (1109384640).

Almost surely, 2^21311505254 is an apocalyptic number.

21311505254 is a deficient number, since it is larger than the sum of its proper divisors (14188803226).

21311505254 is a wasteful number, since it uses less digits than its factorization.

21311505254 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169484.

The product of its (nonzero) digits is 6000, while the sum is 29.

The spelling of 21311505254 in words is "twenty-one billion, three hundred eleven million, five hundred five thousand, two hundred fifty-four".