21357274775 has 12 divisors (see below), whose sum is σ = 26578635912. Its totient is φ = 17024132640.

The previous prime is 21357274769. The next prime is 21357274789. The reversal of 21357274775 is 57747275312.

It is a happy number.

It is not a de Polignac number, because 21357274775 - 2³⁴ = 4177405591 is a prime.

It is a super-2 number, since 2×21357274775² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1535117 + ... + 1548966.

It is an arithmetic number, because the mean of its divisors is an integer number (2214886326).

Almost surely, 2^21357274775 is an apocalyptic number.

21357274775 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21357274775 is a deficient number, since it is larger than the sum of its proper divisors (5221361137).

21357274775 is a wasteful number, since it uses less digits than its factorization.

21357274775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3084370 (or 3084365 counting only the distinct ones).

The product of its digits is 2881200, while the sum is 50.

The spelling of 21357274775 in words is "twenty-one billion, three hundred fifty-seven million, two hundred seventy-four thousand, seven hundred seventy-five".