21440802 has 32 divisors (see below), whose sum is σ = 44712000. Its totient is φ = 6845888.

The previous prime is 21440801. The next prime is 21440803. The reversal of 21440802 is 20804412.

It is an interprime number because it is at equal distance from previous prime (21440801) and next prime (21440803).

It is not an unprimeable number, because it can be changed into a prime (21440801) 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, 25513 + ... + 26339.

It is an arithmetic number, because the mean of its divisors is an integer number (1397250).

Almost surely, 2^21440802 is an apocalyptic number.

21440802 is an abundant number, since it is smaller than the sum of its proper divisors (23271198).

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

21440802 is a wasteful number, since it uses less digits than its factorization.

21440802 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1010.

The product of its (nonzero) digits is 512, while the sum is 21.

The square root of 21440802 is about 4630.4213631159. The cubic root of 21440802 is about 277.8094462146.

The spelling of 21440802 in words is "twenty-one million, four hundred forty thousand, eight hundred two".