19452421 has 2 divisors, whose sum is σ = 19452422. Its totient is φ = 19452420.

The previous prime is 19452413. The next prime is 19452439. The reversal of 19452421 is 12425491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14212900 + 5239521 = 3770^2 + 2289^2 .

It is a cyclic number.

It is not a de Polignac number, because 19452421 - 2³ = 19452413 is a prime.

It is a super-2 number, since 2×19452421² = 756793365522482, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 19452421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19452451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9726210 + 9726211.

It is an arithmetic number, because the mean of its divisors is an integer number (9726211).

Almost surely, 2^19452421 is an apocalyptic number.

It is an amenable number.

19452421 is a deficient number, since it is larger than the sum of its proper divisors (1).

19452421 is an equidigital number, since it uses as much as digits as its factorization.

19452421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2880, while the sum is 28.

The square root of 19452421 is about 4410.4898820879. The cubic root of 19452421 is about 268.9415396055.

The spelling of 19452421 in words is "nineteen million, four hundred fifty-two thousand, four hundred twenty-one".