513138261021 has 16 divisors (see below), whose sum is σ = 702180057600. Its totient is φ = 333210421040.

The previous prime is 513138261017. The next prime is 513138261023. The reversal of 513138261021 is 120162831315.

It is a cyclic number.

It is not a de Polignac number, because 513138261021 - 2² = 513138261017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (513138261023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14494971 + ... + 14530328.

It is an arithmetic number, because the mean of its divisors is an integer number (43886253600).

Almost surely, 2^513138261021 is an apocalyptic number.

It is an amenable number.

513138261021 is a deficient number, since it is larger than the sum of its proper divisors (189041796579).

513138261021 is a wasteful number, since it uses less digits than its factorization.

513138261021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29025456.

The product of its (nonzero) digits is 8640, while the sum is 33.

The spelling of 513138261021 in words is "five hundred thirteen billion, one hundred thirty-eight million, two hundred sixty-one thousand, twenty-one".