221220021210000 has 100 divisors (see below), whose sum is σ = 714127724565552. Its totient is φ = 58992005648000.

The previous prime is 221220021209983. The next prime is 221220021210127. The reversal of 221220021210000 is 12120022122.

It is a tau number, because it is divible by the number of its divisors (100).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 3686970354 + ... + 3687030353.

Almost surely, 2^{221220021210000} is an apocalyptic number.

221220021210000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221220021210000 is an abundant number, since it is smaller than the sum of its proper divisors (492907703355552).

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

221220021210000 is an equidigital number, since it uses as much as digits as its factorization.

221220021210000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7374000738 (or 7374000717 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 221220021210000 its reverse (12120022122), we get a palindrome (221232141232122).

The spelling of 221220021210000 in words is "two hundred twenty-one trillion, two hundred twenty billion, twenty-one million, two hundred ten thousand".