11715615622021 has 2 divisors, whose sum is σ = 11715615622022. Its totient is φ = 11715615622020.

The previous prime is 11715615622001. The next prime is 11715615622031. The reversal of 11715615622021 is 12022651651711.

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., 6401714685921 + 5313900936100 = 2530161^2 + 2305190^2 .

It is a cyclic number.

It is not a de Polignac number, because 11715615622021 - 2¹⁹ = 11715615097733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11715615622001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5857807811010 + 5857807811011.

It is an arithmetic number, because the mean of its divisors is an integer number (5857807811011).

Almost surely, 2^{11715615622021} is an apocalyptic number.

It is an amenable number.

11715615622021 is a deficient number, since it is larger than the sum of its proper divisors (1).

11715615622021 is an equidigital number, since it uses as much as digits as its factorization.

11715615622021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 50400, while the sum is 40.

The spelling of 11715615622021 in words is "eleven trillion, seven hundred fifteen billion, six hundred fifteen million, six hundred twenty-two thousand, twenty-one".