21889260 has 36 divisors (see below), whose sum is σ = 66397968. Its totient is φ = 5837088.

The previous prime is 21889247. The next prime is 21889267. The reversal of 21889260 is 6298812.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (21889267) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 60624 + ... + 60983.

It is an arithmetic number, because the mean of its divisors is an integer number (1844388).

Almost surely, 2^21889260 is an apocalyptic number.

21889260 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21889260 is an abundant number, since it is smaller than the sum of its proper divisors (44508708).

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

21889260 is a wasteful number, since it uses less digits than its factorization.

21889260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121622 (or 121617 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 21889260 is about 4678.5959432291. The cubic root of 21889260 is about 279.7329937648.

The spelling of 21889260 in words is "twenty-one million, eight hundred eighty-nine thousand, two hundred sixty".