21167090 has 32 divisors (see below), whose sum is σ = 43905024. Its totient is φ = 7197120.

The previous prime is 21167077. The next prime is 21167093. The reversal of 21167090 is 9076112.

It is not an unprimeable number, because it can be changed into a prime (21167093) 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, 7700 + ... + 10080.

It is an arithmetic number, because the mean of its divisors is an integer number (1372032).

Almost surely, 2^21167090 is an apocalyptic number.

21167090 is an abundant number, since it is smaller than the sum of its proper divisors (22737934).

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

21167090 is a wasteful number, since it uses less digits than its factorization.

21167090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2522.

The product of its (nonzero) digits is 756, while the sum is 26.

The square root of 21167090 is about 4600.7705876299. The cubic root of 21167090 is about 276.6222134672.

The spelling of 21167090 in words is "twenty-one million, one hundred sixty-seven thousand, ninety".