11421979693 has 2 divisors, whose sum is σ = 11421979694. Its totient is φ = 11421979692.

The previous prime is 11421979633. The next prime is 11421979697. The reversal of 11421979693 is 39697912411.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10559206564 + 862773129 = 102758^2 + 29373^2 .

It is an emirp because it is prime and its reverse (39697912411) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11421979693 - 2²¹ = 11419882541 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11421979693.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11421979697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5710989846 + 5710989847.

It is an arithmetic number, because the mean of its divisors is an integer number (5710989847).

Almost surely, 2^11421979693 is an apocalyptic number.

It is an amenable number.

11421979693 is a deficient number, since it is larger than the sum of its proper divisors (1).

11421979693 is an equidigital number, since it uses as much as digits as its factorization.

11421979693 is an evil number, because the sum of its binary digits is even.

The product of its digits is 734832, while the sum is 52.

The spelling of 11421979693 in words is "eleven billion, four hundred twenty-one million, nine hundred seventy-nine thousand, six hundred ninety-three".