221992731413 has 2 divisors, whose sum is σ = 221992731414. Its totient is φ = 221992731412.

The previous prime is 221992731409. The next prime is 221992731427. The reversal of 221992731413 is 314137299122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 120587424049 + 101405307364 = 347257^2 + 318442^2 .

It is a cyclic number.

It is not a de Polignac number, because 221992731413 - 2² = 221992731409 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221992731463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110996365706 + 110996365707.

It is an arithmetic number, because the mean of its divisors is an integer number (110996365707).

Almost surely, 2^221992731413 is an apocalyptic number.

It is an amenable number.

221992731413 is a deficient number, since it is larger than the sum of its proper divisors (1).

221992731413 is an equidigital number, since it uses as much as digits as its factorization.

221992731413 is an evil number, because the sum of its binary digits is even.

The product of its digits is 163296, while the sum is 44.

The spelling of 221992731413 in words is "two hundred twenty-one billion, nine hundred ninety-two million, seven hundred thirty-one thousand, four hundred thirteen".