21622201361 has 2 divisors, whose sum is σ = 21622201362. Its totient is φ = 21622201360.

The previous prime is 21622201331. The next prime is 21622201369. The reversal of 21622201361 is 16310222612.

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., 18752563600 + 2869637761 = 136940^2 + 53569^2 .

It is a cyclic number.

It is not a de Polignac number, because 21622201361 - 2¹⁸ = 21621939217 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21622201361.

It is not a weakly prime, because it can be changed into another prime (21622201369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10811100680 + 10811100681.

It is an arithmetic number, because the mean of its divisors is an integer number (10811100681).

Almost surely, 2^21622201361 is an apocalyptic number.

It is an amenable number.

21622201361 is a deficient number, since it is larger than the sum of its proper divisors (1).

21622201361 is an equidigital number, since it uses as much as digits as its factorization.

21622201361 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 26.

Adding to 21622201361 its reverse (16310222612), we get a palindrome (37932423973).

The spelling of 21622201361 in words is "twenty-one billion, six hundred twenty-two million, two hundred one thousand, three hundred sixty-one".