21980437175 has 6 divisors (see below), whose sum is σ = 27255742128. Its totient is φ = 17584349720.

The previous prime is 21980437169. The next prime is 21980437177. The reversal of 21980437175 is 57173408912.

It is not a de Polignac number, because 21980437175 - 2¹⁸ = 21980175031 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21980437177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 439608719 + ... + 439608768.

It is an arithmetic number, because the mean of its divisors is an integer number (4542623688).

Almost surely, 2^21980437175 is an apocalyptic number.

21980437175 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21980437175 is a deficient number, since it is larger than the sum of its proper divisors (5275304953).

21980437175 is an equidigital number, since it uses as much as digits as its factorization.

21980437175 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 879217497 (or 879217492 counting only the distinct ones).

The product of its (nonzero) digits is 423360, while the sum is 47.

The spelling of 21980437175 in words is "twenty-one billion, nine hundred eighty million, four hundred thirty-seven thousand, one hundred seventy-five".