421121140123513 has 4 divisors (see below), whose sum is σ = 421121812214260. Its totient is φ = 421120468032768.

The previous prime is 421121140123511. The next prime is 421121140123589. The reversal of 421121140123513 is 315321041121124.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 274694393244649 + 146426746878864 = 16573907^2 + 12100692^2 .

It is a cyclic number.

It is not a de Polignac number, because 421121140123513 - 2¹ = 421121140123511 is a prime.

It is a super-2 number, since 2×421121140123513² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421121140123511) 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, 335104620 + ... + 336358957.

It is an arithmetic number, because the mean of its divisors is an integer number (105280453053565).

Almost surely, 2^{421121140123513} is an apocalyptic number.

It is an amenable number.

421121140123513 is a deficient number, since it is larger than the sum of its proper divisors (672090747).

421121140123513 is an equidigital number, since it uses as much as digits as its factorization.

421121140123513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 672090746.

The product of its (nonzero) digits is 5760, while the sum is 31.

Adding to 421121140123513 its reverse (315321041121124), we get a palindrome (736442181244637).

The spelling of 421121140123513 in words is "four hundred twenty-one trillion, one hundred twenty-one billion, one hundred forty million, one hundred twenty-three thousand, five hundred thirteen".