21161154635535 has 64 divisors (see below), whose sum is σ = 36833660126208. Its totient is φ = 10345255624704.

The previous prime is 21161154635507. The next prime is 21161154635573. The reversal of 21161154635535 is 53553645116112.

It is not a de Polignac number, because 21161154635535 - 2²⁵ = 21161121081103 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 12670674 + ... + 14243183.

It is an arithmetic number, because the mean of its divisors is an integer number (575525939472).

Almost surely, 2^{21161154635535} is an apocalyptic number.

21161154635535 is a deficient number, since it is larger than the sum of its proper divisors (15672505490673).

21161154635535 is a wasteful number, since it uses less digits than its factorization.

21161154635535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26913984.

The product of its digits is 1620000, while the sum is 48.

The spelling of 21161154635535 in words is "twenty-one trillion, one hundred sixty-one billion, one hundred fifty-four million, six hundred thirty-five thousand, five hundred thirty-five".