21621411422489 has 2 divisors, whose sum is σ = 21621411422490. Its totient is φ = 21621411422488.

The previous prime is 21621411422411. The next prime is 21621411422519. The reversal of 21621411422489 is 98422411412612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16074350174089 + 5547061248400 = 4009283^2 + 2355220^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21621411422489 is a prime.

It is not a weakly prime, because it can be changed into another prime (21621411422789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10810705711244 + 10810705711245.

It is an arithmetic number, because the mean of its divisors is an integer number (10810705711245).

Almost surely, 2^{21621411422489} is an apocalyptic number.

It is an amenable number.

21621411422489 is a deficient number, since it is larger than the sum of its proper divisors (1).

21621411422489 is an equidigital number, since it uses as much as digits as its factorization.

21621411422489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 442368, while the sum is 47.

The spelling of 21621411422489 in words is "twenty-one trillion, six hundred twenty-one billion, four hundred eleven million, four hundred twenty-two thousand, four hundred eighty-nine".