21469121 has 2 divisors, whose sum is σ = 21469122. Its totient is φ = 21469120.

The previous prime is 21469073. The next prime is 21469163. The reversal of 21469121 is 12196412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11458225 + 10010896 = 3385^2 + 3164^2 .

It is a cyclic number.

It is not a de Polignac number, because 21469121 - 2⁶ = 21469057 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21469321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10734560 + 10734561.

It is an arithmetic number, because the mean of its divisors is an integer number (10734561).

Almost surely, 2^21469121 is an apocalyptic number.

It is an amenable number.

21469121 is a deficient number, since it is larger than the sum of its proper divisors (1).

21469121 is an equidigital number, since it uses as much as digits as its factorization.

21469121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 26.

The square root of 21469121 is about 4633.4782831044. The cubic root of 21469121 is about 277.9317025952.

The spelling of 21469121 in words is "twenty-one million, four hundred sixty-nine thousand, one hundred twenty-one".