12621911 has 2 divisors, whose sum is σ = 12621912. Its totient is φ = 12621910.

The previous prime is 12621901. The next prime is 12621923. The reversal of 12621911 is 11912621.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12621911 - 2²² = 8427607 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12621901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6310955 + 6310956.

It is an arithmetic number, because the mean of its divisors is an integer number (6310956).

Almost surely, 2^12621911 is an apocalyptic number.

12621911 is a deficient number, since it is larger than the sum of its proper divisors (1).

12621911 is an equidigital number, since it uses as much as digits as its factorization.

12621911 is an evil number, because the sum of its binary digits is even.

The product of its digits is 216, while the sum is 23.

The square root of 12621911 is about 3552.7328917328. The cubic root of 12621911 is about 232.8314830789.

The spelling of 12621911 in words is "twelve million, six hundred twenty-one thousand, nine hundred eleven".