121752406513 has 4 divisors (see below), whose sum is σ = 121753449328. Its totient is φ = 121751363700.

The previous prime is 121752406511. The next prime is 121752406547. The reversal of 121752406513 is 315604257121.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 315604257121 = 223 ⋅1415265727.

It is a cyclic number.

It is not a de Polignac number, because 121752406513 - 2¹ = 121752406511 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121752406511) 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, 320463 + ... + 588388.

It is an arithmetic number, because the mean of its divisors is an integer number (30438362332).

Almost surely, 2^121752406513 is an apocalyptic number.

It is an amenable number.

121752406513 is a deficient number, since it is larger than the sum of its proper divisors (1042815).

121752406513 is an equidigital number, since it uses as much as digits as its factorization.

121752406513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1042814.

The product of its (nonzero) digits is 50400, while the sum is 37.

The spelling of 121752406513 in words is "one hundred twenty-one billion, seven hundred fifty-two million, four hundred six thousand, five hundred thirteen".