1520212113121 has 8 divisors (see below), whose sum is σ = 1693605007080. Its totient is φ = 1354884004992.

The previous prime is 1520212113103. The next prime is 1520212113127. The reversal of 1520212113121 is 1213112120251.

It can be written as a sum of positive squares in 4 ways, for example, as 113767917025 + 1406444196096 = 337295^2 + 1185936^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1520212113121 - 2⁹ = 1520212112609 is a prime.

It is a super-2 number, since 2×1520212113121² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1520212113092 and 1520212113101.

It is not an unprimeable number, because it can be changed into a prime (1520212113127) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2016196060 + ... + 2016196813.

It is an arithmetic number, because the mean of its divisors is an integer number (211700625885).

Almost surely, 2^{1520212113121} is an apocalyptic number.

It is an amenable number.

1520212113121 is a deficient number, since it is larger than the sum of its proper divisors (173392893959).

1520212113121 is a wasteful number, since it uses less digits than its factorization.

1520212113121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4032392915.

The product of its (nonzero) digits is 240, while the sum is 22.

Adding to 1520212113121 its reverse (1213112120251), we get a palindrome (2733324233372).

The spelling of 1520212113121 in words is "one trillion, five hundred twenty billion, two hundred twelve million, one hundred thirteen thousand, one hundred twenty-one".