21926490 has 32 divisors (see below), whose sum is σ = 52781760. Its totient is φ = 5829504.

The previous prime is 21926483. The next prime is 21926491. The reversal of 21926490 is 9462912.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21926491) 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, 11377 + ... + 13163.

It is an arithmetic number, because the mean of its divisors is an integer number (1649430).

Almost surely, 2^21926490 is an apocalyptic number.

21926490 is an abundant number, since it is smaller than the sum of its proper divisors (30855270).

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

21926490 is a wasteful number, since it uses less digits than its factorization.

21926490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2206.

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 21926490 is about 4682.5730106428. The cubic root of 21926490 is about 279.8914970751.

The spelling of 21926490 in words is "twenty-one million, nine hundred twenty-six thousand, four hundred ninety".