1512540390421 has 2 divisors, whose sum is σ = 1512540390422. Its totient is φ = 1512540390420.

The previous prime is 1512540390409. The next prime is 1512540390443. The reversal of 1512540390421 is 1240930452151.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1488609847396 + 23930543025 = 1220086^2 + 154695^2 .

It is a cyclic number.

It is not a de Polignac number, because 1512540390421 - 2²⁵ = 1512506835989 is a prime.

It is a super-2 number, since 2×1512540390421² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1512540393421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 756270195210 + 756270195211.

It is an arithmetic number, because the mean of its divisors is an integer number (756270195211).

Almost surely, 2^{1512540390421} is an apocalyptic number.

It is an amenable number.

1512540390421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1512540390421 is an equidigital number, since it uses as much as digits as its factorization.

1512540390421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 43200, while the sum is 37.

The spelling of 1512540390421 in words is "one trillion, five hundred twelve billion, five hundred forty million, three hundred ninety thousand, four hundred twenty-one".