21262411213 has 2 divisors, whose sum is σ = 21262411214. Its totient is φ = 21262411212.

The previous prime is 21262411199. The next prime is 21262411217. The reversal of 21262411213 is 31211426212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20322498249 + 939912964 = 142557^2 + 30658^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21262411213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21262411217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10631205606 + 10631205607.

It is an arithmetic number, because the mean of its divisors is an integer number (10631205607).

Almost surely, 2^21262411213 is an apocalyptic number.

It is an amenable number.

21262411213 is a deficient number, since it is larger than the sum of its proper divisors (1).

21262411213 is an equidigital number, since it uses as much as digits as its factorization.

21262411213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1152, while the sum is 25.

Adding to 21262411213 its reverse (31211426212), we get a palindrome (52473837425).

The spelling of 21262411213 in words is "twenty-one billion, two hundred sixty-two million, four hundred eleven thousand, two hundred thirteen".