21222021300 has 72 divisors (see below), whose sum is σ = 61693572192. Its totient is φ = 5632368000.

The previous prime is 21222021251. The next prime is 21222021311. The reversal of 21222021300 is 312022212.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21222021300.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 104331 + ... + 230930.

Almost surely, 2^21222021300 is an apocalyptic number.

21222021300 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21222021300 is an abundant number, since it is smaller than the sum of its proper divisors (40471550892).

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

21222021300 is a wasteful number, since it uses less digits than its factorization.

21222021300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335489 (or 335482 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

Adding to 21222021300 its reverse (312022212), we get a palindrome (21534043512).

The spelling of 21222021300 in words is "twenty-one billion, two hundred twenty-two million, twenty-one thousand, three hundred".