2221928303921 has 4 divisors (see below), whose sum is σ = 2223641434212. Its totient is φ = 2220215173632.

The previous prime is 2221928303869. The next prime is 2221928303927. The reversal of 2221928303921 is 1293038291222.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2175816754225 + 46111549696 = 1475065^2 + 214736^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2221928303921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2221928303927) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 856563200 + ... + 856565793.

It is an arithmetic number, because the mean of its divisors is an integer number (555910358553).

Almost surely, 2^{2221928303921} is an apocalyptic number.

It is an amenable number.

2221928303921 is a deficient number, since it is larger than the sum of its proper divisors (1713130291).

2221928303921 is a wasteful number, since it uses less digits than its factorization.

2221928303921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1713130290.

The product of its (nonzero) digits is 186624, while the sum is 44.

The spelling of 2221928303921 in words is "two trillion, two hundred twenty-one billion, nine hundred twenty-eight million, three hundred three thousand, nine hundred twenty-one".