221431473715657 has 4 divisors (see below), whose sum is σ = 221468985406080. Its totient is φ = 221393962025236.

The previous prime is 221431473715649. The next prime is 221431473715667. The reversal of 221431473715657 is 756517374134122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 221431473715657 - 2³ = 221431473715649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221431473715667) 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, 18755836357 + ... + 18755848162.

It is an arithmetic number, because the mean of its divisors is an integer number (55367246351520).

Almost surely, 2^{221431473715657} is an apocalyptic number.

It is an amenable number.

221431473715657 is a deficient number, since it is larger than the sum of its proper divisors (37511690423).

221431473715657 is an equidigital number, since it uses as much as digits as its factorization.

221431473715657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37511690422.

The product of its digits is 29635200, while the sum is 58.

The spelling of 221431473715657 in words is "two hundred twenty-one trillion, four hundred thirty-one billion, four hundred seventy-three million, seven hundred fifteen thousand, six hundred fifty-seven".