21208808802 has 16 divisors (see below), whose sum is σ = 42420208032. Its totient is φ = 7069171200.

The previous prime is 21208808801. The next prime is 21208808821. The reversal of 21208808802 is 20880880212.

It is not an unprimeable number, because it can be changed into a prime (21208808801) 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, 8098 + ... + 206114.

It is an arithmetic number, because the mean of its divisors is an integer number (2651263002).

Almost surely, 2^21208808802 is an apocalyptic number.

21208808802 is an abundant number, since it is smaller than the sum of its proper divisors (21211399230).

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

21208808802 is a wasteful number, since it uses less digits than its factorization.

21208808802 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215873.

The product of its (nonzero) digits is 32768, while the sum is 39.

The spelling of 21208808802 in words is "twenty-one billion, two hundred eight million, eight hundred eight thousand, eight hundred two".