21590411 has 2 divisors, whose sum is σ = 21590412. Its totient is φ = 21590410.

The previous prime is 21590369. The next prime is 21590417. The reversal of 21590411 is 11409512.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21590411 - 2¹⁴ = 21574027 is a prime.

It is a super-2 number, since 2×21590411² = 932291694297842, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21590417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10795205 + 10795206.

It is an arithmetic number, because the mean of its divisors is an integer number (10795206).

Almost surely, 2^21590411 is an apocalyptic number.

21590411 is a deficient number, since it is larger than the sum of its proper divisors (1).

21590411 is an equidigital number, since it uses as much as digits as its factorization.

21590411 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 360, while the sum is 23.

The square root of 21590411 is about 4646.5482887838. The cubic root of 21590411 is about 278.4541126249.

Adding to 21590411 its reverse (11409512), we get a palindrome (32999923).

The spelling of 21590411 in words is "twenty-one million, five hundred ninety thousand, four hundred eleven".