221200021121000 has 32 divisors (see below), whose sum is σ = 517608049425480. Its totient is φ = 88480008448000.

The previous prime is 221200021120987. The next prime is 221200021121011. The reversal of 221200021121000 is 121120002122.

It can be written as a sum of positive squares in 4 ways, for example, as 22883383860964 + 198316637260036 = 4783658^2 + 14082494^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 110600009561 + ... + 110600011560.

Almost surely, 2^{221200021121000} is an apocalyptic number.

221200021121000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221200021121000 is an abundant number, since it is smaller than the sum of its proper divisors (296408028304480).

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

221200021121000 is a wasteful number, since it uses less digits than its factorization.

221200021121000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221200021142 (or 221200021128 counting only the distinct ones).

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

Adding to 221200021121000 its reverse (121120002122), we get a palindrome (221321141123122).

The spelling of 221200021121000 in words is "two hundred twenty-one trillion, two hundred billion, twenty-one million, one hundred twenty-one thousand".