21282090 has 32 divisors (see below), whose sum is σ = 53766720. Its totient is φ = 5376384.

The previous prime is 21282083. The next prime is 21282103. The reversal of 21282090 is 9028212.

It is a self number, because there is not a number n which added to its sum of digits gives 21282090.

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, 18099 + ... + 19238.

It is an arithmetic number, because the mean of its divisors is an integer number (1680210).

Almost surely, 2^21282090 is an apocalyptic number.

21282090 is an abundant number, since it is smaller than the sum of its proper divisors (32484630).

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

21282090 is a wasteful number, since it uses less digits than its factorization.

21282090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37366.

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 21282090 is about 4613.2515647859. The cubic root of 21282090 is about 277.1222683084.

The spelling of 21282090 in words is "twenty-one million, two hundred eighty-two thousand, ninety".