15196421 has 2 divisors, whose sum is σ = 15196422. Its totient is φ = 15196420.

The previous prime is 15196411. The next prime is 15196457. The reversal of 15196421 is 12469151.

15196421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11628100 + 3568321 = 3410^2 + 1889^2 .

It is a cyclic number.

It is not a de Polignac number, because 15196421 - 2¹⁸ = 14934277 is a prime.

It is a super-2 number, since 2×15196421² = 461862422418482, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15196411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7598210 + 7598211.

It is an arithmetic number, because the mean of its divisors is an integer number (7598211).

Almost surely, 2^15196421 is an apocalyptic number.

It is an amenable number.

15196421 is a deficient number, since it is larger than the sum of its proper divisors (1).

15196421 is an equidigital number, since it uses as much as digits as its factorization.

15196421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2160, while the sum is 29.

The square root of 15196421 is about 3898.2587138362. The cubic root of 15196421 is about 247.6930222307.

The spelling of 15196421 in words is "fifteen million, one hundred ninety-six thousand, four hundred twenty-one".