21402213113 has 2 divisors, whose sum is σ = 21402213114. Its totient is φ = 21402213112.

The previous prime is 21402213089. The next prime is 21402213127. The reversal of 21402213113 is 31131220412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21160939024 + 241274089 = 145468^2 + 15533^2 .

It is a cyclic number.

It is not a de Polignac number, because 21402213113 - 2²⁰ = 21401164537 is a prime.

It is a super-2 number, since 2×21402213113² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (21402213143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10701106556 + 10701106557.

It is an arithmetic number, because the mean of its divisors is an integer number (10701106557).

Almost surely, 2^21402213113 is an apocalyptic number.

It is an amenable number.

21402213113 is a deficient number, since it is larger than the sum of its proper divisors (1).

21402213113 is an equidigital number, since it uses as much as digits as its factorization.

21402213113 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 21402213113 its reverse (31131220412), we get a palindrome (52533433525).

The spelling of 21402213113 in words is "twenty-one billion, four hundred two million, two hundred thirteen thousand, one hundred thirteen".