1215005121 has 12 divisors (see below), whose sum is σ = 1914553680. Its totient is φ = 736366680.

The previous prime is 1215005117. The next prime is 1215005167.

1215005121 is a `hidden beast` number, since 1 + 2 + 150 + 0 + 512 + 1 = 666.

1215005121 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 1215005121 - 2² = 1215005117 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1215005094 and 1215005103.

It is not an unprimeable number, because it can be changed into a prime (1215005101) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6136291 + ... + 6136488.

It is an arithmetic number, because the mean of its divisors is an integer number (159546140).

Almost surely, 2^1215005121 is an apocalyptic number.

1215005121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1215005121 is a deficient number, since it is larger than the sum of its proper divisors (699548559).

1215005121 is a wasteful number, since it uses less digits than its factorization.

1215005121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12272796 (or 12272793 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 18.

The square root of 1215005121 is about 34856.9235733735. The cubic root of 1215005121 is about 1067.0694905096.

It can be divided in two parts, 121500 and 5121, that added together give a palindrome (126621).

The spelling of 1215005121 in words is "one billion, two hundred fifteen million, five thousand, one hundred twenty-one".