21180258437 has 12 divisors (see below), whose sum is σ = 22973234400. Its totient is φ = 19518275088.

The previous prime is 21180258427. The next prime is 21180258439. The reversal of 21180258437 is 73485208112.

It is not a de Polignac number, because 21180258437 - 2²⁴ = 21163481221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21180258394 and 21180258403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21180258439) 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, 3383 + ... + 205844.

It is an arithmetic number, because the mean of its divisors is an integer number (1914436200).

Almost surely, 2^21180258437 is an apocalyptic number.

It is an amenable number.

21180258437 is a deficient number, since it is larger than the sum of its proper divisors (1792975963).

21180258437 is a wasteful number, since it uses less digits than its factorization.

21180258437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209852 (or 209839 counting only the distinct ones).

The product of its (nonzero) digits is 107520, while the sum is 41.

The spelling of 21180258437 in words is "twenty-one billion, one hundred eighty million, two hundred fifty-eight thousand, four hundred thirty-seven".