21362105113621 has 2 divisors, whose sum is σ = 21362105113622. Its totient is φ = 21362105113620.

The previous prime is 21362105113577. The next prime is 21362105113639. The reversal of 21362105113621 is 12631150126312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20361483016900 + 1000622096721 = 4512370^2 + 1000311^2 .

It is a cyclic number.

It is not a de Polignac number, because 21362105113621 - 2¹⁵ = 21362105080853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21362105113651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10681052556810 + 10681052556811.

It is an arithmetic number, because the mean of its divisors is an integer number (10681052556811).

Almost surely, 2^{21362105113621} is an apocalyptic number.

It is an amenable number.

21362105113621 is a deficient number, since it is larger than the sum of its proper divisors (1).

21362105113621 is an equidigital number, since it uses as much as digits as its factorization.

21362105113621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 34.

Adding to 21362105113621 its reverse (12631150126312), we get a palindrome (33993255239933).

The spelling of 21362105113621 in words is "twenty-one trillion, three hundred sixty-two billion, one hundred five million, one hundred thirteen thousand, six hundred twenty-one".