21136885408045 has 16 divisors (see below), whose sum is σ = 29126425826880. Its totient is φ = 14563212912000.

The previous prime is 21136885408003. The next prime is 21136885408099. The reversal of 21136885408045 is 54080458863112.

It is not a de Polignac number, because 21136885408045 - 2¹⁷ = 21136885276973 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (55).

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, 10113341256 + ... + 10113343345.

It is an arithmetic number, because the mean of its divisors is an integer number (1820401614180).

Almost surely, 2^{21136885408045} is an apocalyptic number.

It is an amenable number.

21136885408045 is a deficient number, since it is larger than the sum of its proper divisors (7989540418835).

21136885408045 is a wasteful number, since it uses less digits than its factorization.

21136885408045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20226684636.

The product of its (nonzero) digits is 7372800, while the sum is 55.

The spelling of 21136885408045 in words is "twenty-one trillion, one hundred thirty-six billion, eight hundred eighty-five million, four hundred eight thousand, forty-five".