221400445012000 has 96 divisors (see below), whose sum is σ = 552898613567664. Its totient is φ = 87108371712000.

The previous prime is 221400445011979. The next prime is 221400445012063. The reversal of 221400445012000 is 210544004122.

It can be written as a sum of positive squares in 8 ways, for example, as 26842470864784 + 194557974147216 = 5180972^2 + 13948404^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 453445437 + ... + 453933436.

Almost surely, 2^{221400445012000} is an apocalyptic number.

221400445012000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221400445012000 is an abundant number, since it is smaller than the sum of its proper divisors (331498168555664).

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

221400445012000 is an equidigital number, since it uses as much as digits as its factorization.

221400445012000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 907378959 (or 907378941 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 25.

Adding to 221400445012000 its reverse (210544004122), we get a palindrome (221610989016122).

The spelling of 221400445012000 in words is "two hundred twenty-one trillion, four hundred billion, four hundred forty-five million, twelve thousand".