513231050021 has 4 divisors (see below), whose sum is σ = 514881310944. Its totient is φ = 511580789100.

The previous prime is 513231050009. The next prime is 513231050027. The reversal of 513231050021 is 120050132315.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-513231050021 is a prime.

It is a super-2 number, since 2×513231050021² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (513231050027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 825129995 + ... + 825130616.

It is an arithmetic number, because the mean of its divisors is an integer number (128720327736).

Almost surely, 2^513231050021 is an apocalyptic number.

It is an amenable number.

513231050021 is a deficient number, since it is larger than the sum of its proper divisors (1650260923).

513231050021 is a wasteful number, since it uses less digits than its factorization.

513231050021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1650260922.

The product of its (nonzero) digits is 900, while the sum is 23.

Adding to 513231050021 its reverse (120050132315), we get a palindrome (633281182336).

The spelling of 513231050021 in words is "five hundred thirteen billion, two hundred thirty-one million, fifty thousand, twenty-one".