21021333200 has 90 divisors (see below), whose sum is σ = 58749318486. Its totient is φ = 7207307520.

The previous prime is 21021333173. The next prime is 21021333233. The reversal of 21021333200 is 233312012.

It can be written as a sum of positive squares in 3 ways, for example, as 1405650064 + 19615683136 = 37492^2 + 140056^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 516659 + ... + 555858.

Almost surely, 2^21021333200 is an apocalyptic number.

21021333200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21021333200 is an abundant number, since it is smaller than the sum of its proper divisors (37727985286).

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

21021333200 is a wasteful number, since it uses less digits than its factorization.

21021333200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1072549 (or 1072531 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 17.

Adding to 21021333200 its reverse (233312012), we get a palindrome (21254645212).

The spelling of 21021333200 in words is "twenty-one billion, twenty-one million, three hundred thirty-three thousand, two hundred".