215134245440 has 112 divisors (see below), whose sum is σ = 518672844288. Its totient is φ = 84986732544.

The previous prime is 215134245419. The next prime is 215134245467. The reversal of 215134245440 is 44542431512.

It is a happy number.

It is a super-2 number, since 2×215134245440² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 215134245440.

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, 10222769 + ... + 10243791.

Almost surely, 2^215134245440 is an apocalyptic number.

215134245440 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 215134245440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (259336422144).

215134245440 is an abundant number, since it is smaller than the sum of its proper divisors (303538598848).

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

215134245440 is a wasteful number, since it uses less digits than its factorization.

215134245440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21436 (or 21426 counting only the distinct ones).

The product of its (nonzero) digits is 76800, while the sum is 35.

Adding to 215134245440 its reverse (44542431512), we get a palindrome (259676676952).

The spelling of 215134245440 in words is "two hundred fifteen billion, one hundred thirty-four million, two hundred forty-five thousand, four hundred forty".