21365554755475 has 48 divisors (see below), whose sum is σ = 31257397620736. Its totient is φ = 14176864944000.

The previous prime is 21365554755437. The next prime is 21365554755533. The reversal of 21365554755475 is 57455745556312.

It is not a de Polignac number, because 21365554755475 - 2⁴¹ = 19166531499923 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 66442330 + ... + 66763120.

Almost surely, 2^{21365554755475} is an apocalyptic number.

21365554755475 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21365554755475 is a deficient number, since it is larger than the sum of its proper divisors (9891842865261).

21365554755475 is a wasteful number, since it uses less digits than its factorization.

21365554755475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333116 (or 333111 counting only the distinct ones).

The product of its digits is 441000000, while the sum is 64.

The spelling of 21365554755475 in words is "twenty-one trillion, three hundred sixty-five billion, five hundred fifty-four million, seven hundred fifty-five thousand, four hundred seventy-five".