11421947 has 2 divisors, whose sum is σ = 11421948. Its totient is φ = 11421946.

The previous prime is 11421913. The next prime is 11421953. The reversal of 11421947 is 74912411.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 11421947 - 2²⁰ = 10373371 is a prime.

It is not a weakly prime, because it can be changed into another prime (11421967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5710973 + 5710974.

It is an arithmetic number, because the mean of its divisors is an integer number (5710974).

Almost surely, 2^11421947 is an apocalyptic number.

11421947 is a deficient number, since it is larger than the sum of its proper divisors (1).

11421947 is an equidigital number, since it uses as much as digits as its factorization.

11421947 is an evil number, because the sum of its binary digits is even.

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

The square root of 11421947 is about 3379.6371106969. The cubic root of 11421947 is about 225.2060466435.

The spelling of 11421947 in words is "eleven million, four hundred twenty-one thousand, nine hundred forty-seven".