11621220671 has 2 divisors, whose sum is σ = 11621220672. Its totient is φ = 11621220670.

The previous prime is 11621220647. The next prime is 11621220679. The reversal of 11621220671 is 17602212611.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 11621220671 - 2⁶ = 11621220607 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11621220679) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5810610335 + 5810610336.

It is an arithmetic number, because the mean of its divisors is an integer number (5810610336).

Almost surely, 2^11621220671 is an apocalyptic number.

11621220671 is a deficient number, since it is larger than the sum of its proper divisors (1).

11621220671 is an equidigital number, since it uses as much as digits as its factorization.

11621220671 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 29.

The spelling of 11621220671 in words is "eleven billion, six hundred twenty-one million, two hundred twenty thousand, six hundred seventy-one".