11969428951621 has 4 divisors (see below), whose sum is σ = 12029576836000. Its totient is φ = 11909281067244.

The previous prime is 11969428951553. The next prime is 11969428951681. The reversal of 11969428951621 is 12615982496911.

11969428951621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 a de Polignac number, because none of the positive numbers 2^k-11969428951621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11969428951681) 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, 30073941891 + ... + 30073942288.

It is an arithmetic number, because the mean of its divisors is an integer number (3007394209000).

Almost surely, 2^{11969428951621} is an apocalyptic number.

It is an amenable number.

11969428951621 is a deficient number, since it is larger than the sum of its proper divisors (60147884379).

11969428951621 is an equidigital number, since it uses as much as digits as its factorization.

11969428951621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60147884378.

The product of its digits is 16796160, while the sum is 64.

The spelling of 11969428951621 in words is "eleven trillion, nine hundred sixty-nine billion, four hundred twenty-eight million, nine hundred fifty-one thousand, six hundred twenty-one".