21650893 has 6 divisors (see below), whose sum is σ = 23798222. Its totient is φ = 19682520.

The previous prime is 21650873. The next prime is 21650897. The reversal of 21650893 is 39805612.

It can be written as a sum of positive squares in only one way, i.e., 21650409 + 484 = 4653^2 + 22^2 .

It is not a de Polignac number, because 21650893 - 2¹⁷ = 21519821 is a prime.

It is a super-2 number, since 2×21650893² = 937522335394898, which 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 (21650897) 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, 89346 + ... + 89587.

Almost surely, 2^21650893 is an apocalyptic number.

It is an amenable number.

21650893 is a deficient number, since it is larger than the sum of its proper divisors (2147329).

21650893 is a wasteful number, since it uses less digits than its factorization.

21650893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178955 (or 178944 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 21650893 is about 4653.0520091656. The cubic root of 21650893 is about 278.7138847350.

The spelling of 21650893 in words is "twenty-one million, six hundred fifty thousand, eight hundred ninety-three".