13621144469 has 2 divisors, whose sum is σ = 13621144470. Its totient is φ = 13621144468.

The previous prime is 13621144423. The next prime is 13621144483. The reversal of 13621144469 is 96444112631.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13610022244 + 11122225 = 116662^2 + 3335^2 .

It is an emirp because it is prime and its reverse (96444112631) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13621144469 - 2³² = 9326177173 is a prime.

It is a super-2 number, since 2×13621144469² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13621144769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6810572234 + 6810572235.

It is an arithmetic number, because the mean of its divisors is an integer number (6810572235).

Almost surely, 2^13621144469 is an apocalyptic number.

It is an amenable number.

13621144469 is a deficient number, since it is larger than the sum of its proper divisors (1).

13621144469 is an equidigital number, since it uses as much as digits as its factorization.

13621144469 is an evil number, because the sum of its binary digits is even.

The product of its digits is 124416, while the sum is 41.

The spelling of 13621144469 in words is "thirteen billion, six hundred twenty-one million, one hundred forty-four thousand, four hundred sixty-nine".