21220023013200 has 180 divisors, whose sum is σ = 80333863029888. Its totient is φ = 5144247993600.

The previous prime is 21220023013109. The next prime is 21220023013201. The reversal of 21220023013200 is 231032002212.

21220023013200 is a `hidden beast` number, since 2 + 1 + 220 + 0 + 230 + 13 + 200 = 666.

It is a tau number, because it is divible by the number of its divisors (180).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220023013201) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 267889984 + ... + 267969183.

Almost surely, 2^{21220023013200} is an apocalyptic number.

21220023013200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21220023013200 is an abundant number, since it is smaller than the sum of its proper divisors (59113840016688).

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

21220023013200 is a wasteful number, since it uses less digits than its factorization.

21220023013200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 535859202 (or 535859188 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 21220023013200 its reverse (231032002212), we get a palindrome (21451055015412).

The spelling of 21220023013200 in words is "twenty-one trillion, two hundred twenty billion, twenty-three million, thirteen thousand, two hundred".