21802002 has 16 divisors (see below), whose sum is σ = 43727232. Its totient is φ = 7246800.

The previous prime is 21801943. The next prime is 21802009. The reversal of 21802002 is 20020812.

It is not an unprimeable number, because it can be changed into a prime (21802009) 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, 2749 + ... + 7152.

It is an arithmetic number, because the mean of its divisors is an integer number (2732952).

Almost surely, 2^21802002 is an apocalyptic number.

21802002 is an abundant number, since it is smaller than the sum of its proper divisors (21925230).

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

21802002 is a wasteful number, since it uses less digits than its factorization.

21802002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10273.

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 21802002 is about 4669.2613976945. The cubic root of 21802002 is about 279.3607952880.

Adding to 21802002 its reverse (20020812), we get a palindrome (41822814).

The spelling of 21802002 in words is "twenty-one million, eight hundred two thousand, two".