15204002253421 has 2 divisors, whose sum is σ = 15204002253422. Its totient is φ = 15204002253420.

The previous prime is 15204002253367. The next prime is 15204002253431. The reversal of 15204002253421 is 12435220040251.

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., 8326947066025 + 6877055187396 = 2885645^2 + 2622414^2 .

It is an emirp because it is prime and its reverse (12435220040251) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 15204002253421 - 2²⁹ = 15203465382509 is a prime.

It is a super-5 number, since 5×15204002253421⁵ (a number of 67 digits) contains 55555 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15204002253431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7602001126710 + 7602001126711.

It is an arithmetic number, because the mean of its divisors is an integer number (7602001126711).

Almost surely, 2^{15204002253421} is an apocalyptic number.

It is an amenable number.

15204002253421 is a deficient number, since it is larger than the sum of its proper divisors (1).

15204002253421 is an equidigital number, since it uses as much as digits as its factorization.

15204002253421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19200, while the sum is 31.

Adding to 15204002253421 its reverse (12435220040251), we get a palindrome (27639222293672).

The spelling of 15204002253421 in words is "fifteen trillion, two hundred four billion, two million, two hundred fifty-three thousand, four hundred twenty-one".