21442187847200 has 36 divisors (see below), whose sum is σ = 52345741083930. Its totient is φ = 8576875138560.

The previous prime is 21442187847169. The next prime is 21442187847209. The reversal of 21442187847200 is 274878124412.

It can be written as a sum of positive squares in 3 ways, for example, as 20831958153616 + 610229693584 = 4564204^2 + 781172^2 .

It is a super-2 number, since 2×21442187847200² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (50).

It is not an unprimeable number, because it can be changed into a prime (21442187847209) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13401366605 + ... + 13401368204.

Almost surely, 2^{21442187847200} is an apocalyptic number.

21442187847200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21442187847200 is an abundant number, since it is smaller than the sum of its proper divisors (30903553236730).

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

21442187847200 is a wasteful number, since it uses less digits than its factorization.

21442187847200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26802734829 (or 26802734816 counting only the distinct ones).

The product of its (nonzero) digits is 1605632, while the sum is 50.

The spelling of 21442187847200 in words is "twenty-one trillion, four hundred forty-two billion, one hundred eighty-seven million, eight hundred forty-seven thousand, two hundred".