11421621643 has 2 divisors, whose sum is σ = 11421621644. Its totient is φ = 11421621642.

The previous prime is 11421621619. The next prime is 11421621703. The reversal of 11421621643 is 34612612411.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11421621643 - 2⁵ = 11421621611 is a prime.

It is not a weakly prime, because it can be changed into another prime (11421621143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5710810821 + 5710810822.

It is an arithmetic number, because the mean of its divisors is an integer number (5710810822).

Almost surely, 2^11421621643 is an apocalyptic number.

11421621643 is a deficient number, since it is larger than the sum of its proper divisors (1).

11421621643 is an equidigital number, since it uses as much as digits as its factorization.

11421621643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6912, while the sum is 31.

The spelling of 11421621643 in words is "eleven billion, four hundred twenty-one million, six hundred twenty-one thousand, six hundred forty-three".