21553104011577 has 8 divisors (see below), whose sum is σ = 29438385967200. Its totient is φ = 14018279031840.

The previous prime is 21553104011561. The next prime is 21553104011617. The reversal of 21553104011577 is 77511040135512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21553104011577 - 2⁴ = 21553104011561 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21553104011557) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 87614243827 + ... + 87614244072.

It is an arithmetic number, because the mean of its divisors is an integer number (3679798245900).

Almost surely, 2^{21553104011577} is an apocalyptic number.

It is an amenable number.

21553104011577 is a deficient number, since it is larger than the sum of its proper divisors (7885281955623).

21553104011577 is a wasteful number, since it uses less digits than its factorization.

21553104011577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175228487943.

The product of its (nonzero) digits is 147000, while the sum is 42.

The spelling of 21553104011577 in words is "twenty-one trillion, five hundred fifty-three billion, one hundred four million, eleven thousand, five hundred seventy-seven".