13621220989 has 4 divisors (see below), whose sum is σ = 13621470624. Its totient is φ = 13620971356.

The previous prime is 13621220971. The next prime is 13621221041. The reversal of 13621220989 is 98902212631.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 13621220989 - 2²⁹ = 13084350077 is a prime.

It is a super-2 number, since 2×13621220989² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13621220939) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3967 + ... + 165100.

It is an arithmetic number, because the mean of its divisors is an integer number (3405367656).

Almost surely, 2^13621220989 is an apocalyptic number.

It is an amenable number.

13621220989 is a deficient number, since it is larger than the sum of its proper divisors (249635).

13621220989 is an equidigital number, since it uses as much as digits as its factorization.

13621220989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249634.

The product of its (nonzero) digits is 93312, while the sum is 43.

The spelling of 13621220989 in words is "thirteen billion, six hundred twenty-one million, two hundred twenty thousand, nine hundred eighty-nine".