21934089 has 6 divisors (see below), whose sum is σ = 31682586. Its totient is φ = 14622720.

The previous prime is 21934079. The next prime is 21934093. The reversal of 21934089 is 98043912.

It can be written as a sum of positive squares in only one way, i.e., 21930489 + 3600 = 4683^2 + 60^2 .

It is not a de Polignac number, because 21934089 - 2⁹ = 21933577 is a prime.

It is a super-2 number, since 2×21934089² = 962208520519842, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21934039) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1218552 + ... + 1218569.

It is an arithmetic number, because the mean of its divisors is an integer number (5280431).

Almost surely, 2^21934089 is an apocalyptic number.

It is an amenable number.

21934089 is a deficient number, since it is larger than the sum of its proper divisors (9748497).

21934089 is a wasteful number, since it uses less digits than its factorization.

21934089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2437127 (or 2437124 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 21934089 is about 4683.3843532215. The cubic root of 21934089 is about 279.9238270684.

The spelling of 21934089 in words is "twenty-one million, nine hundred thirty-four thousand, eighty-nine".