21290419 has 2 divisors, whose sum is σ = 21290420. Its totient is φ = 21290418.

The previous prime is 21290417. The next prime is 21290441. The reversal of 21290419 is 91409212.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21290419 - 2¹ = 21290417 is a prime.

It is a super-2 number, since 2×21290419² = 906563882391122, which contains 22 as substring.

Together with 21290417, it forms a pair of twin primes.

It is equal to p_1347175 and since 21290419 and 1347175 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (21290411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10645209 + 10645210.

It is an arithmetic number, because the mean of its divisors is an integer number (10645210).

Almost surely, 2^21290419 is an apocalyptic number.

21290419 is a deficient number, since it is larger than the sum of its proper divisors (1).

21290419 is an equidigital number, since it uses as much as digits as its factorization.

21290419 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 21290419 is about 4614.1542020180. The cubic root of 21290419 is about 277.1584152960.

It can be divided in two parts, 2 and 1290419, that added together give a triangular number (1290421 = T₁₆₀₆).

The spelling of 21290419 in words is "twenty-one million, two hundred ninety thousand, four hundred nineteen".