221421261711613 has 4 divisors (see below), whose sum is σ = 221428683766108. Its totient is φ = 221413839657120.

The previous prime is 221421261711607. The next prime is 221421261711701. The reversal of 221421261711613 is 316117162124122.

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 55506716780089 + 165914544931524 = 7450283^2 + 12880782^2 .

It is a cyclic number.

It is not a de Polignac number, because 221421261711613 - 2²¹ = 221421259614461 is a prime.

It is a super-2 number, since 2×221421261711613² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221421264711613) 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, 3710982498 + ... + 3711042163.

It is an arithmetic number, because the mean of its divisors is an integer number (55357170941527).

Almost surely, 2^{221421261711613} is an apocalyptic number.

It is an amenable number.

221421261711613 is a deficient number, since it is larger than the sum of its proper divisors (7422054495).

221421261711613 is an equidigital number, since it uses as much as digits as its factorization.

221421261711613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7422054494.

The product of its digits is 48384, while the sum is 40.

The spelling of 221421261711613 in words is "two hundred twenty-one trillion, four hundred twenty-one billion, two hundred sixty-one million, seven hundred eleven thousand, six hundred thirteen".