221239121257 has 32 divisors (see below), whose sum is σ = 284820480000. Its totient is φ = 166779043200.

The previous prime is 221239121237. The next prime is 221239121321. The reversal of 221239121257 is 752121932122.

It is a de Polignac number, because none of the positive numbers 2^k-221239121257 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221239121227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8338869 + ... + 8365357.

It is an arithmetic number, because the mean of its divisors is an integer number (8900640000).

Almost surely, 2^221239121257 is an apocalyptic number.

It is an amenable number.

221239121257 is a deficient number, since it is larger than the sum of its proper divisors (63581358743).

221239121257 is a wasteful number, since it uses less digits than its factorization.

221239121257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30037.

The product of its digits is 30240, while the sum is 37.

The spelling of 221239121257 in words is "two hundred twenty-one billion, two hundred thirty-nine million, one hundred twenty-one thousand, two hundred fifty-seven".