11421647621 has 2 divisors, whose sum is σ = 11421647622. Its totient is φ = 11421647620.

The previous prime is 11421647581. The next prime is 11421647641. The reversal of 11421647621 is 12674612411.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9917371396 + 1504276225 = 99586^2 + 38785^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11421647621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11421647641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5710823810 + 5710823811.

It is an arithmetic number, because the mean of its divisors is an integer number (5710823811).

Almost surely, 2^11421647621 is an apocalyptic number.

It is an amenable number.

11421647621 is a deficient number, since it is larger than the sum of its proper divisors (1).

11421647621 is an equidigital number, since it uses as much as digits as its factorization.

11421647621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16128, while the sum is 35.

The spelling of 11421647621 in words is "eleven billion, four hundred twenty-one million, six hundred forty-seven thousand, six hundred twenty-one".