11955421 has 2 divisors, whose sum is σ = 11955422. Its totient is φ = 11955420.

The previous prime is 11955407. The next prime is 11955439. The reversal of 11955421 is 12455911.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10329796 + 1625625 = 3214^2 + 1275^2 .

It is a cyclic number.

It is not a de Polignac number, because 11955421 - 2²¹ = 9858269 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11955421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11955121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5977710 + 5977711.

It is an arithmetic number, because the mean of its divisors is an integer number (5977711).

Almost surely, 2^11955421 is an apocalyptic number.

It is an amenable number.

11955421 is a deficient number, since it is larger than the sum of its proper divisors (1).

11955421 is an equidigital number, since it uses as much as digits as its factorization.

11955421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1800, while the sum is 28.

The square root of 11955421 is about 3457.6612037619. The cubic root of 11955421 is about 228.6589955220.

The spelling of 11955421 in words is "eleven million, nine hundred fifty-five thousand, four hundred twenty-one".