21719802 has 16 divisors (see below), whose sum is σ = 46781280. Its totient is φ = 6682992.

The previous prime is 21719801. The next prime is 21719807. The reversal of 21719802 is 20891712.

It is a self number, because there is not a number n which added to its sum of digits gives 21719802.

It is not an unprimeable number, because it can be changed into a prime (21719801) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 139152 + ... + 139307.

It is an arithmetic number, because the mean of its divisors is an integer number (2923830).

Almost surely, 2^21719802 is an apocalyptic number.

21719802 is an abundant number, since it is smaller than the sum of its proper divisors (25061478).

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

21719802 is a wasteful number, since it uses less digits than its factorization.

21719802 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278477.

The product of its (nonzero) digits is 2016, while the sum is 30.

The square root of 21719802 is about 4660.4508365608. The cubic root of 21719802 is about 279.0092621634.

The spelling of 21719802 in words is "twenty-one million, seven hundred nineteen thousand, eight hundred two".