215428733091 has 48 divisors (see below), whose sum is σ = 374077896192. Its totient is φ = 117716760000.

The previous prime is 215428733083. The next prime is 215428733119. The reversal of 215428733091 is 190337824512.

It is a happy number.

215428733091 is a `hidden beast` number, since 2 + 1 + 542 + 8 + 73 + 30 + 9 + 1 = 666.

It is not a de Polignac number, because 215428733091 - 2³ = 215428733083 is a prime.

It is not an unprimeable number, because it can be changed into a prime (215428733791) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1891035 + ... + 2001716.

It is an arithmetic number, because the mean of its divisors is an integer number (7793289504).

Almost surely, 2^215428733091 is an apocalyptic number.

215428733091 is a deficient number, since it is larger than the sum of its proper divisors (158649163101).

215428733091 is a wasteful number, since it uses less digits than its factorization.

215428733091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3892824 (or 3892821 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 45.

The spelling of 215428733091 in words is "two hundred fifteen billion, four hundred twenty-eight million, seven hundred thirty-three thousand, ninety-one".