21833437 has 2 divisors, whose sum is σ = 21833438. Its totient is φ = 21833436.

The previous prime is 21833431. The next prime is 21833447. The reversal of 21833437 is 73433812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15452761 + 6380676 = 3931^2 + 2526^2 .

It is a cyclic number.

It is not a de Polignac number, because 21833437 - 2²³ = 13444829 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21833399 and 21833408.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21833431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10916718 + 10916719.

It is an arithmetic number, because the mean of its divisors is an integer number (10916719).

Almost surely, 2^21833437 is an apocalyptic number.

It is an amenable number.

21833437 is a deficient number, since it is larger than the sum of its proper divisors (1).

21833437 is an equidigital number, since it uses as much as digits as its factorization.

21833437 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12096, while the sum is 31.

The square root of 21833437 is about 4672.6263492815. The cubic root of 21833437 is about 279.4949953394.

The spelling of 21833437 in words is "twenty-one million, eight hundred thirty-three thousand, four hundred thirty-seven".