21220133200 has 60 divisors (see below), whose sum is σ = 58264430560. Its totient is φ = 7275473280.

The previous prime is 21220133197. The next prime is 21220133203. The reversal of 21220133200 is 233102212.

It is an interprime number because it is at equal distance from previous prime (21220133197) and next prime (21220133203).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220133203) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3786510 + ... + 3792109.

Almost surely, 2^21220133200 is an apocalyptic number.

21220133200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21220133200 is an abundant number, since it is smaller than the sum of its proper divisors (37044297360).

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

21220133200 is a wasteful number, since it uses less digits than its factorization.

21220133200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7578644 (or 7578633 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 21220133200 its reverse (233102212), we get a palindrome (21453235412).

The spelling of 21220133200 in words is "twenty-one billion, two hundred twenty million, one hundred thirty-three thousand, two hundred".