221050121940 has 72 divisors (see below), whose sum is σ = 688640851080. Its totient is φ = 57353543424.

The previous prime is 221050121939. The next prime is 221050121959. The reversal of 221050121940 is 49121050122.

It can be written as a sum of positive squares in 4 ways, for example, as 17176199364 + 203873922576 = 131058^2 + 451524^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16588695 + ... + 16602014.

It is an arithmetic number, because the mean of its divisors is an integer number (9564456265).

Almost surely, 2^221050121940 is an apocalyptic number.

221050121940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221050121940 is an abundant number, since it is smaller than the sum of its proper divisors (467590729140).

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

221050121940 is a wasteful number, since it uses less digits than its factorization.

221050121940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33190761 (or 33190756 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The spelling of 221050121940 in words is "two hundred twenty-one billion, fifty million, one hundred twenty-one thousand, nine hundred forty".