221929545613 has 2 divisors, whose sum is σ = 221929545614. Its totient is φ = 221929545612.

The previous prime is 221929545577. The next prime is 221929545623. The reversal of 221929545613 is 316545929122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 128976511689 + 92953033924 = 359133^2 + 304882^2 .

It is a cyclic number.

It is not a de Polignac number, because 221929545613 - 2²¹ = 221927448461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221929545623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110964772806 + 110964772807.

It is an arithmetic number, because the mean of its divisors is an integer number (110964772807).

Almost surely, 2^221929545613 is an apocalyptic number.

It is an amenable number.

221929545613 is a deficient number, since it is larger than the sum of its proper divisors (1).

221929545613 is an equidigital number, since it uses as much as digits as its factorization.

221929545613 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1166400, while the sum is 49.

The spelling of 221929545613 in words is "two hundred twenty-one billion, nine hundred twenty-nine million, five hundred forty-five thousand, six hundred thirteen".