215021943 has 12 divisors (see below), whose sum is σ = 310722048. Its totient is φ = 143285760.

The previous prime is 215021929. The next prime is 215021951. The reversal of 215021943 is 349120512.

It is not a de Polignac number, because 215021943 - 2⁴ = 215021927 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215021143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27658 + ... + 34568.

It is an arithmetic number, because the mean of its divisors is an integer number (25893504).

Almost surely, 2^215021943 is an apocalyptic number.

215021943 is a deficient number, since it is larger than the sum of its proper divisors (95700105).

215021943 is a wasteful number, since it uses less digits than its factorization.

215021943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10374 (or 10371 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 215021943 is about 14663.6265296140. The cubic root of 215021943 is about 599.0930213403.

The spelling of 215021943 in words is "two hundred fifteen million, twenty-one thousand, nine hundred forty-three".