215231591040 has 128 divisors (see below), whose sum is σ = 686212931520. Its totient is φ = 57381519360.

The previous prime is 215231591011. The next prime is 215231591051. The reversal of 215231591040 is 40195132512.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (128).

It is a junction number, because it is equal to n+sod(n) for n = 215231590992 and 215231591010.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10128907 + ... + 10150133.

Almost surely, 2^215231591040 is an apocalyptic number.

215231591040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 215231591040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (343106465760).

215231591040 is an abundant number, since it is smaller than the sum of its proper divisors (470981340480).

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

215231591040 is a wasteful number, since it uses less digits than its factorization.

215231591040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26530 (or 26518 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 33.

The spelling of 215231591040 in words is "two hundred fifteen billion, two hundred thirty-one million, five hundred ninety-one thousand, forty".