21183090 has 32 divisors (see below), whose sum is σ = 52024896. Its totient is φ = 5517120.

The previous prime is 21183089. The next prime is 21183091. The reversal of 21183090 is 9038112.

It is an interprime number because it is at equal distance from previous prime (21183089) and next prime (21183091).

It is a self number, because there is not a number n which added to its sum of digits gives 21183090.

It is not an unprimeable number, because it can be changed into a prime (21183091) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6921 + ... + 9500.

It is an arithmetic number, because the mean of its divisors is an integer number (1625778).

Almost surely, 2^21183090 is an apocalyptic number.

21183090 is an abundant number, since it is smaller than the sum of its proper divisors (30841806).

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

21183090 is a wasteful number, since it uses less digits than its factorization.

21183090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16474.

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 21183090 is about 4602.5090983071. The cubic root of 21183090 is about 276.6918946044.

The spelling of 21183090 in words is "twenty-one million, one hundred eighty-three thousand, ninety".