21889337 has 4 divisors (see below), whose sum is σ = 21970980. Its totient is φ = 21807696.

The previous prime is 21889333. The next prime is 21889363. The reversal of 21889337 is 73398812.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10471696 + 11417641 = 3236^2 + 3379^2 .

It is a cyclic number.

It is not a de Polignac number, because 21889337 - 2² = 21889333 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21889294 and 21889303.

It is not an unprimeable number, because it can be changed into a prime (21889333) 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, 40418 + ... + 40955.

It is an arithmetic number, because the mean of its divisors is an integer number (5492745).

Almost surely, 2^21889337 is an apocalyptic number.

It is an amenable number.

21889337 is a deficient number, since it is larger than the sum of its proper divisors (81643).

21889337 is an equidigital number, since it uses as much as digits as its factorization.

21889337 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81642.

The product of its digits is 72576, while the sum is 41.

The square root of 21889337 is about 4678.6041721864. The cubic root of 21889337 is about 279.7333217706.

The spelling of 21889337 in words is "twenty-one million, eight hundred eighty-nine thousand, three hundred thirty-seven".