21611121574430 has 16 divisors (see below), whose sum is σ = 39084379116624. Its totient is φ = 8603479678080.

The previous prime is 21611121574411. The next prime is 21611121574457. The reversal of 21611121574430 is 3447512111612.

It is a congruent number.

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, 5121116747 + ... + 5121120966.

It is an arithmetic number, because the mean of its divisors is an integer number (2442773694789).

Almost surely, 2^{21611121574430} is an apocalyptic number.

21611121574430 is a deficient number, since it is larger than the sum of its proper divisors (17473257542194).

21611121574430 is a wasteful number, since it uses less digits than its factorization.

21611121574430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10242237931.

The product of its (nonzero) digits is 40320, while the sum is 38.

The spelling of 21611121574430 in words is "twenty-one trillion, six hundred eleven billion, one hundred twenty-one million, five hundred seventy-four thousand, four hundred thirty".