11621921 has 2 divisors, whose sum is σ = 11621922. Its totient is φ = 11621920.

The previous prime is 11621873. The next prime is 11621941. The reversal of 11621921 is 12912611.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10923025 + 698896 = 3305^2 + 836^2 .

It is a cyclic number.

It is not a de Polignac number, because 11621921 - 2²² = 7427617 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (11621941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5810960 + 5810961.

It is an arithmetic number, because the mean of its divisors is an integer number (5810961).

Almost surely, 2^11621921 is an apocalyptic number.

It is an amenable number.

11621921 is a deficient number, since it is larger than the sum of its proper divisors (1).

11621921 is an equidigital number, since it uses as much as digits as its factorization.

11621921 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 11621921 is about 3409.0938678775. The cubic root of 11621921 is about 226.5127432010.

The spelling of 11621921 in words is "eleven million, six hundred twenty-one thousand, nine hundred twenty-one".