513124123433221 has 16 divisors (see below), whose sum is σ = 536948750776320. Its totient is φ = 489754426239360.

The previous prime is 513124123433161. The next prime is 513124123433261. The reversal of 513124123433221 is 122334321421315.

It is a cyclic number.

It is not a de Polignac number, because 513124123433221 - 2¹³ = 513124123425029 is a prime.

It is a super-2 number, since 2×513124123433221² (a number of 30 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 (513124123433261) 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, 71028036 + ... + 77918098.

It is an arithmetic number, because the mean of its divisors is an integer number (33559296923520).

Almost surely, 2^{513124123433221} is an apocalyptic number.

It is an amenable number.

513124123433221 is a deficient number, since it is larger than the sum of its proper divisors (23824627343099).

513124123433221 is a wasteful number, since it uses less digits than its factorization.

513124123433221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6923076.

The product of its digits is 103680, while the sum is 37.

Adding to 513124123433221 its reverse (122334321421315), we get a palindrome (635458444854536).

The spelling of 513124123433221 in words is "five hundred thirteen trillion, one hundred twenty-four billion, one hundred twenty-three million, four hundred thirty-three thousand, two hundred twenty-one".