21914437 has 4 divisors (see below), whose sum is σ = 21975840. Its totient is φ = 21853036.

The previous prime is 21914419. The next prime is 21914443. The reversal of 21914437 is 73441912.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21914437 - 2¹¹ = 21912389 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21914399 and 21914408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21915437) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30163 + ... + 30880.

It is an arithmetic number, because the mean of its divisors is an integer number (5493960).

Almost surely, 2^21914437 is an apocalyptic number.

It is an amenable number.

21914437 is a deficient number, since it is larger than the sum of its proper divisors (61403).

21914437 is an equidigital number, since it uses as much as digits as its factorization.

21914437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61402.

The product of its digits is 6048, while the sum is 31.

The square root of 21914437 is about 4681.2858276333. The cubic root of 21914437 is about 279.8402021870.

The spelling of 21914437 in words is "twenty-one million, nine hundred fourteen thousand, four hundred thirty-seven".