221221100102000 has 80 divisors (see below), whose sum is σ = 539124531059712. Its totient is φ = 87791680569600.

The previous prime is 221221100101999. The next prime is 221221100102033. The reversal of 221221100102000 is 201001122122.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

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, 435220607 + ... + 435728606.

Almost surely, 2^{221221100102000} is an apocalyptic number.

221221100102000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221221100102000 is an abundant number, since it is smaller than the sum of its proper divisors (317903430957712).

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

221221100102000 is a wasteful number, since it uses less digits than its factorization.

221221100102000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 870949363 (or 870949347 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 221221100102000 its reverse (201001122122), we get a palindrome (221422101224122).

The spelling of 221221100102000 in words is "two hundred twenty-one trillion, two hundred twenty-one billion, one hundred million, one hundred two thousand".