215440102444 has 48 divisors (see below), whose sum is σ = 445432006656. Its totient is φ = 89221968000.

The previous prime is 215440102441. The next prime is 215440102469. The reversal of 215440102444 is 444201044512.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is not an unprimeable number, because it can be changed into a prime (215440102441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 411144 + ... + 774544.

It is an arithmetic number, because the mean of its divisors is an integer number (9279833472).

Almost surely, 2^215440102444 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 215440102444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (222716003328).

215440102444 is an abundant number, since it is smaller than the sum of its proper divisors (229991904212).

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

215440102444 is a wasteful number, since it uses less digits than its factorization.

215440102444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 364126 (or 364124 counting only the distinct ones).

The product of its (nonzero) digits is 20480, while the sum is 31.

Adding to 215440102444 its reverse (444201044512), we get a palindrome (659641146956).

The spelling of 215440102444 in words is "two hundred fifteen billion, four hundred forty million, one hundred two thousand, four hundred forty-four".