21074794175 has 12 divisors (see below), whose sum is σ = 27669965616. Its totient is φ = 15868080000.

The previous prime is 21074794171. The next prime is 21074794183. The reversal of 21074794175 is 57149747012.

It is a happy number.

It is not a de Polignac number, because 21074794175 - 2² = 21074794171 is a prime.

It is a super-2 number, since 2×21074794175² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21074794171) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24793451 + ... + 24794300.

It is an arithmetic number, because the mean of its divisors is an integer number (2305830468).

Almost surely, 2^21074794175 is an apocalyptic number.

21074794175 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21074794175 is a deficient number, since it is larger than the sum of its proper divisors (6595171441).

21074794175 is a wasteful number, since it uses less digits than its factorization.

21074794175 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49587778 (or 49587773 counting only the distinct ones).

The product of its (nonzero) digits is 493920, while the sum is 47.

The spelling of 21074794175 in words is "twenty-one billion, seventy-four million, seven hundred ninety-four thousand, one hundred seventy-five".