121645315013 has 4 divisors (see below), whose sum is σ = 121646018508. Its totient is φ = 121644611520.

The previous prime is 121645315003. The next prime is 121645315031. The reversal of 121645315013 is 310513546121.

121645315013 = 246622² + 246623².

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 310513546121 = 17 ⋅18265502713.

It can be written as a sum of positive squares in 2 ways, for example, as 60822410884 + 60822904129 = 246622^2 + 246623^2 .

It is a cyclic number.

It is not a de Polignac number, because 121645315013 - 2⁶ = 121645314949 is a prime.

It is a super-2 number, since 2×121645315013² (a number of 23 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 (121645315003) 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, 107453 + ... + 504813.

It is an arithmetic number, because the mean of its divisors is an integer number (30411504627).

Almost surely, 2^121645315013 is an apocalyptic number.

121645315013 is the 246623-rd centered square number.

It is an amenable number.

121645315013 is a deficient number, since it is larger than the sum of its proper divisors (703495).

121645315013 is an equidigital number, since it uses as much as digits as its factorization.

121645315013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 703494.

The product of its (nonzero) digits is 10800, while the sum is 32.

The spelling of 121645315013 in words is "one hundred twenty-one billion, six hundred forty-five million, three hundred fifteen thousand, thirteen".