21190469 has 2 divisors, whose sum is σ = 21190470. Its totient is φ = 21190468.

The previous prime is 21190459. The next prime is 21190471. The reversal of 21190469 is 96409112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12517444 + 8673025 = 3538^2 + 2945^2 .

It is a cyclic number.

It is not a de Polignac number, because 21190469 - 2²⁰ = 20141893 is a prime.

It is a super-2 number, since 2×21190469² = 898071952879922, which contains 22 as substring.

Together with 21190471, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21190409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10595234 + 10595235.

It is an arithmetic number, because the mean of its divisors is an integer number (10595235).

Almost surely, 2^21190469 is an apocalyptic number.

It is an amenable number.

21190469 is a deficient number, since it is larger than the sum of its proper divisors (1).

21190469 is an equidigital number, since it uses as much as digits as its factorization.

21190469 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 21190469 is about 4603.3106564732. The cubic root of 21190469 is about 276.7240188517.

The spelling of 21190469 in words is "twenty-one million, one hundred ninety thousand, four hundred sixty-nine".