215021268 has 72 divisors (see below), whose sum is σ = 677651520. Its totient is φ = 55848960.

The previous prime is 215021251. The next prime is 215021269. The reversal of 215021268 is 862120512.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215021269) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 36013 + ... + 41556.

Almost surely, 2^215021268 is an apocalyptic number.

215021268 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

215021268 is an abundant number, since it is smaller than the sum of its proper divisors (462630252).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

215021268 is a wasteful number, since it uses less digits than its factorization.

215021268 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77597 (or 77592 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 215021268 is about 14663.6035134615. The cubic root of 215021268 is about 599.0923944459.

The spelling of 215021268 in words is "two hundred fifteen million, twenty-one thousand, two hundred sixty-eight".