21980930117 has 2 divisors, whose sum is σ = 21980930118. Its totient is φ = 21980930116.

The previous prime is 21980930033. The next prime is 21980930123. The reversal of 21980930117 is 71103908912.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21550533601 + 430396516 = 146801^2 + 20746^2 .

It is a cyclic number.

It is not a de Polignac number, because 21980930117 - 2¹² = 21980926021 is a prime.

It is a super-2 number, since 2×21980930117² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21980930617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10990465058 + 10990465059.

It is an arithmetic number, because the mean of its divisors is an integer number (10990465059).

Almost surely, 2^21980930117 is an apocalyptic number.

It is an amenable number.

21980930117 is a deficient number, since it is larger than the sum of its proper divisors (1).

21980930117 is an equidigital number, since it uses as much as digits as its factorization.

21980930117 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27216, while the sum is 41.

The spelling of 21980930117 in words is "twenty-one billion, nine hundred eighty million, nine hundred thirty thousand, one hundred seventeen".