15952421 has 2 divisors, whose sum is σ = 15952422. Its totient is φ = 15952420.

The previous prime is 15952399. The next prime is 15952429. The reversal of 15952421 is 12425951.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15124321 + 828100 = 3889^2 + 910^2 .

It is an emirp because it is prime and its reverse (12425951) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 15952421 - 2⁶ = 15952357 is a prime.

It is a super-2 number, since 2×15952421² = 508959471522482, 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 (15952429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7976210 + 7976211.

It is an arithmetic number, because the mean of its divisors is an integer number (7976211).

Almost surely, 2^15952421 is an apocalyptic number.

It is an amenable number.

15952421 is a deficient number, since it is larger than the sum of its proper divisors (1).

15952421 is an equidigital number, since it uses as much as digits as its factorization.

15952421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3600, while the sum is 29.

The square root of 15952421 is about 3994.0481970051. The cubic root of 15952421 is about 251.7341878873.

The spelling of 15952421 in words is "fifteen million, nine hundred fifty-two thousand, four hundred twenty-one".