21540312554 has 16 divisors (see below), whose sum is σ = 32738301792. Its totient is φ = 10627851408.

The previous prime is 21540312529. The next prime is 21540312593. The reversal of 21540312554 is 45521304512.

It is a self number, because there is not a number n which added to its sum of digits gives 21540312554.

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, 65537 + ... + 217659.

It is an arithmetic number, because the mean of its divisors is an integer number (2046143862).

Almost surely, 2^21540312554 is an apocalyptic number.

21540312554 is a deficient number, since it is larger than the sum of its proper divisors (11197989238).

21540312554 is a wasteful number, since it uses less digits than its factorization.

21540312554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153061.

The product of its (nonzero) digits is 24000, while the sum is 32.

The spelling of 21540312554 in words is "twenty-one billion, five hundred forty million, three hundred twelve thousand, five hundred fifty-four".