215121512 has 16 divisors (see below), whose sum is σ = 403712100. Its totient is φ = 107464960.

The previous prime is 215121509. The next prime is 215121527.

215121512 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 2 ways, for example, as 213568996 + 1552516 = 14614^2 + 1246^2 .

It is a super-2 number, since 2×215121512² = 92554529850332288, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1937 + ... + 20832.

Almost surely, 2^215121512 is an apocalyptic number.

It is an amenable number.

215121512 is a deficient number, since it is larger than the sum of its proper divisors (188590588).

215121512 is a wasteful number, since it uses less digits than its factorization.

215121512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23956 (or 23952 counting only the distinct ones).

The product of its digits is 200, while the sum is 20.

The square root of 215121512 is about 14667.0212381383. The cubic root of 215121512 is about 599.1854799474.

The spelling of 215121512 in words is "two hundred fifteen million, one hundred twenty-one thousand, five hundred twelve".