15872871428621 has 2 divisors, whose sum is σ = 15872871428622. Its totient is φ = 15872871428620.

The previous prime is 15872871428597. The next prime is 15872871428773. The reversal of 15872871428621 is 12682417827851.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13278291435721 + 2594579992900 = 3643939^2 + 1610770^2 .

It is a cyclic number.

It is not a de Polignac number, because 15872871428621 - 2³⁴ = 15855691559437 is a prime.

It is a super-3 number, since 3×15872871428621³ (a number of 41 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15872877428621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7936435714310 + 7936435714311.

It is an arithmetic number, because the mean of its divisors is an integer number (7936435714311).

Almost surely, 2^{15872871428621} is an apocalyptic number.

It is an amenable number.

15872871428621 is a deficient number, since it is larger than the sum of its proper divisors (1).

15872871428621 is an equidigital number, since it uses as much as digits as its factorization.

15872871428621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24084480, while the sum is 62.

The spelling of 15872871428621 in words is "fifteen trillion, eight hundred seventy-two billion, eight hundred seventy-one million, four hundred twenty-eight thousand, six hundred twenty-one".