221933991457 has 4 divisors (see below), whose sum is σ = 221958300820. Its totient is φ = 221909682096.

The previous prime is 221933991437. The next prime is 221933991481. The reversal of 221933991457 is 754199339122.

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 194537452096 + 27396539361 = 441064^2 + 165519^2 .

It is a cyclic number.

It is not a de Polignac number, because 221933991457 - 2¹⁵ = 221933958689 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221933991398 and 221933991407.

It is not an unprimeable number, because it can be changed into a prime (221933991437) 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, 12140982 + ... + 12159247.

It is an arithmetic number, because the mean of its divisors is an integer number (55489575205).

Almost surely, 2^221933991457 is an apocalyptic number.

It is an amenable number.

221933991457 is a deficient number, since it is larger than the sum of its proper divisors (24309363).

221933991457 is an equidigital number, since it uses as much as digits as its factorization.

221933991457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24309362.

The product of its digits is 3674160, while the sum is 55.

The spelling of 221933991457 in words is "two hundred twenty-one billion, nine hundred thirty-three million, nine hundred ninety-one thousand, four hundred fifty-seven".