21022213200 has 60 divisors (see below), whose sum is σ = 67341160128. Its totient is φ = 5605923200.

The previous prime is 21022213193. The next prime is 21022213207. The reversal of 21022213200 is 231222012.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21022213193) and next prime (21022213207).

It is a tau number, because it is divible by the number of its divisors (60).

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 21022213200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21022213207) 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, 8758056 + ... + 8760455.

Almost surely, 2^21022213200 is an apocalyptic number.

21022213200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21022213200 is an abundant number, since it is smaller than the sum of its proper divisors (46318946928).

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

21022213200 is a wasteful number, since it uses less digits than its factorization.

21022213200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17518532 (or 17518521 counting only the distinct ones).

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

Adding to 21022213200 its reverse (231222012), we get a palindrome (21253435212).

The spelling of 21022213200 in words is "twenty-one billion, twenty-two million, two hundred thirteen thousand, two hundred".