21440622 has 32 divisors (see below), whose sum is σ = 50206464. Its totient is φ = 5976000.

The previous prime is 21440609. The next prime is 21440647. The reversal of 21440622 is 22604412.

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

It is a congruent number.

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, 4504 + ... + 7947.

It is an arithmetic number, because the mean of its divisors is an integer number (1568952).

Almost surely, 2^21440622 is an apocalyptic number.

21440622 is an abundant number, since it is smaller than the sum of its proper divisors (28765842).

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

21440622 is a wasteful number, since it uses less digits than its factorization.

21440622 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12504.

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 21440622 is about 4630.4019263990. The cubic root of 21440622 is about 277.8086687897.

The spelling of 21440622 in words is "twenty-one million, four hundred forty thousand, six hundred twenty-two".