15948706421 has 2 divisors, whose sum is σ = 15948706422. Its totient is φ = 15948706420.

The previous prime is 15948706337. The next prime is 15948706439. The reversal of 15948706421 is 12460784951.

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., 8138565796 + 7810140625 = 90214^2 + 88375^2 .

It is a cyclic number.

It is not a de Polignac number, because 15948706421 - 2³⁰ = 14874964597 is a prime.

It is a super-2 number, since 2×15948706421² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15948706721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7974353210 + 7974353211.

It is an arithmetic number, because the mean of its divisors is an integer number (7974353211).

Almost surely, 2^15948706421 is an apocalyptic number.

It is an amenable number.

15948706421 is a deficient number, since it is larger than the sum of its proper divisors (1).

15948706421 is an equidigital number, since it uses as much as digits as its factorization.

15948706421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 483840, while the sum is 47.

The spelling of 15948706421 in words is "fifteen billion, nine hundred forty-eight million, seven hundred six thousand, four hundred twenty-one".