121215213511145 has 16 divisors (see below), whose sum is σ = 158793206999952. Its totient is φ = 88286570680320.

The previous prime is 121215213511129. The next prime is 121215213511153. The reversal of 121215213511145 is 541115312512121.

It can be written as a sum of positive squares in 8 ways, for example, as 13377394030144 + 107837819481001 = 3657512^2 + 10384499^2 .

It is not a de Polignac number, because 121215213511145 - 2⁴ = 121215213511129 is a prime.

It is a super-2 number, since 2×121215213511145² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12772936616 + ... + 12772946105.

It is an arithmetic number, because the mean of its divisors is an integer number (9924575437497).

Almost surely, 2^{121215213511145} is an apocalyptic number.

It is an amenable number.

121215213511145 is a deficient number, since it is larger than the sum of its proper divisors (37577993488807).

121215213511145 is a wasteful number, since it uses less digits than its factorization.

121215213511145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25545882812.

The product of its digits is 12000, while the sum is 35.

The spelling of 121215213511145 in words is "one hundred twenty-one trillion, two hundred fifteen billion, two hundred thirteen million, five hundred eleven thousand, one hundred forty-five".