21889038 has 32 divisors (see below), whose sum is σ = 45573120. Its totient is φ = 7001280.

The previous prime is 21889019. The next prime is 21889061. The reversal of 21889038 is 83098812.

It is a junction number, because it is equal to n+sod(n) for n = 21888987 and 21889005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25053 + ... + 25911.

It is an arithmetic number, because the mean of its divisors is an integer number (1424160).

Almost surely, 2^21889038 is an apocalyptic number.

21889038 is an abundant number, since it is smaller than the sum of its proper divisors (23684082).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21889038 is a wasteful number, since it uses less digits than its factorization.

21889038 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1032.

The product of its (nonzero) digits is 27648, while the sum is 39.

The square root of 21889038 is about 4678.5722181024. The cubic root of 21889038 is about 279.7320480813.

The spelling of 21889038 in words is "twenty-one million, eight hundred eighty-nine thousand, thirty-eight".