21140490 has 32 divisors (see below), whose sum is σ = 57985920. Its totient is φ = 4832064.

The previous prime is 21140423. The next prime is 21140501. The reversal of 21140490 is 9404112.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a zygodrome in base 4.

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, 50125 + ... + 50544.

It is an arithmetic number, because the mean of its divisors is an integer number (1812060).

Almost surely, 2^21140490 is an apocalyptic number.

21140490 is an abundant number, since it is smaller than the sum of its proper divisors (36845430).

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

21140490 is a wasteful number, since it uses less digits than its factorization.

21140490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100686.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 21140490 is about 4597.8788587783. The cubic root of 21140490 is about 276.5062908206.

The spelling of 21140490 in words is "twenty-one million, one hundred forty thousand, four hundred ninety".