11401921 has 2 divisors, whose sum is σ = 11401922. Its totient is φ = 11401920.

The previous prime is 11401909. The next prime is 11401931. The reversal of 11401921 is 12910411.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10653696 + 748225 = 3264^2 + 865^2 .

It is an emirp because it is prime and its reverse (12910411) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11401921 - 2⁵ = 11401889 is a prime.

It is not a weakly prime, because it can be changed into another prime (11401931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5700960 + 5700961.

It is an arithmetic number, because the mean of its divisors is an integer number (5700961).

Almost surely, 2^11401921 is an apocalyptic number.

It is an amenable number.

11401921 is a deficient number, since it is larger than the sum of its proper divisors (1).

11401921 is an equidigital number, since it uses as much as digits as its factorization.

11401921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 19.

The square root of 11401921 is about 3376.6730667922. The cubic root of 11401921 is about 225.0743523819.

The spelling of 11401921 in words is "eleven million, four hundred one thousand, nine hundred twenty-one".