21893153 has 2 divisors, whose sum is σ = 21893154. Its totient is φ = 21893152.

The previous prime is 21893147. The next prime is 21893167. The reversal of 21893153 is 35139812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17698849 + 4194304 = 4207^2 + 2048^2 .

It is a cyclic number.

It is not a de Polignac number, because 21893153 - 2⁶ = 21893089 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (21893143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10946576 + 10946577.

It is an arithmetic number, because the mean of its divisors is an integer number (10946577).

Almost surely, 2^21893153 is an apocalyptic number.

It is an amenable number.

21893153 is a deficient number, since it is larger than the sum of its proper divisors (1).

21893153 is an equidigital number, since it uses as much as digits as its factorization.

21893153 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6480, while the sum is 32.

The square root of 21893153 is about 4679.0119683540. The cubic root of 21893153 is about 279.7495762652.

The spelling of 21893153 in words is "twenty-one million, eight hundred ninety-three thousand, one hundred fifty-three".