15351421 has 2 divisors, whose sum is σ = 15351422. Its totient is φ = 15351420.

The previous prime is 15351383. The next prime is 15351433. The reversal of 15351421 is 12415351.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11148921 + 4202500 = 3339^2 + 2050^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15351421 is a prime.

It is a super-2 number, since 2×15351421² = 471332253438482, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 15351392 and 15351401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15351481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7675710 + 7675711.

It is an arithmetic number, because the mean of its divisors is an integer number (7675711).

Almost surely, 2^15351421 is an apocalyptic number.

It is an amenable number.

15351421 is a deficient number, since it is larger than the sum of its proper divisors (1).

15351421 is an equidigital number, since it uses as much as digits as its factorization.

15351421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 600, while the sum is 22.

The square root of 15351421 is about 3918.0889474334. The cubic root of 15351421 is about 248.5323124345.

Adding to 15351421 its reverse (12415351), we get a palindrome (27766772).

The spelling of 15351421 in words is "fifteen million, three hundred fifty-one thousand, four hundred twenty-one".