21906941184 has 90 divisors (see below), whose sum is σ = 65322596570. Its totient is φ = 7302306816.

The previous prime is 21906941171. The next prime is 21906941191. The reversal of 21906941184 is 48114960912.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 21362745600 + 544195584 = 146160^2 + 23328^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 507499 + ... + 548970.

Almost surely, 2^21906941184 is an apocalyptic number.

21906941184 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21906941184 is an abundant number, since it is smaller than the sum of its proper divisors (43415655386).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21906941184 is an equidigital number, since it uses as much as digits as its factorization.

21906941184 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1056497 (or 1056474 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 45.

The spelling of 21906941184 in words is "twenty-one billion, nine hundred six million, nine hundred forty-one thousand, one hundred eighty-four".