21889037 has 4 divisors (see below), whose sum is σ = 21899520. Its totient is φ = 21878556.

The previous prime is 21889019. The next prime is 21889061. The reversal of 21889037 is 73098812.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 21889037 - 2⁶ = 21888973 is a prime.

It is a pancake number, because a pancake can be divided into 21889037 parts by 6616 straight cuts.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21889067) 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, 923 + ... + 6680.

It is an arithmetic number, because the mean of its divisors is an integer number (5474880).

Almost surely, 2^21889037 is an apocalyptic number.

It is an amenable number.

21889037 is a deficient number, since it is larger than the sum of its proper divisors (10483).

21889037 is an equidigital number, since it uses as much as digits as its factorization.

21889037 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10482.

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 21889037 is about 4678.5721112322. The cubic root of 21889037 is about 279.7320438215.

The spelling of 21889037 in words is "twenty-one million, eight hundred eighty-nine thousand, thirty-seven".