215121051 has 12 divisors (see below), whose sum is σ = 310867128. Its totient is φ = 143350944.

The previous prime is 215121031. The next prime is 215121083. The reversal of 215121051 is 150121512.

It is not a de Polignac number, because 215121051 - 2⁵ = 215121019 is a prime.

It is not an unprimeable number, because it can be changed into a prime (215121031) 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, 26311 + ... + 33503.

It is an arithmetic number, because the mean of its divisors is an integer number (25905594).

Almost surely, 2^215121051 is an apocalyptic number.

215121051 is a deficient number, since it is larger than the sum of its proper divisors (95746077).

215121051 is a wasteful number, since it uses less digits than its factorization.

215121051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10522 (or 10519 counting only the distinct ones).

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

The square root of 215121051 is about 14667.0055226007. The cubic root of 215121051 is about 599.1850519339.

Adding to 215121051 its reverse (150121512), we get a palindrome (365242563).

The spelling of 215121051 in words is "two hundred fifteen million, one hundred twenty-one thousand, fifty-one".