215140422 has 64 divisors (see below), whose sum is σ = 508677120. Its totient is φ = 59377536.

The previous prime is 215140379. The next prime is 215140469. The reversal of 215140422 is 224041512.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 259104 + ... + 259932.

It is an arithmetic number, because the mean of its divisors is an integer number (7948080).

Almost surely, 2^215140422 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 215140422, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (254338560).

215140422 is an abundant number, since it is smaller than the sum of its proper divisors (293536698).

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

215140422 is a wasteful number, since it uses less digits than its factorization.

215140422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1045.

The product of its (nonzero) digits is 640, while the sum is 21.

The square root of 215140422 is about 14667.6658674787. The cubic root of 215140422 is about 599.2030363280.

Adding to 215140422 its reverse (224041512), we get a palindrome (439181934).

The spelling of 215140422 in words is "two hundred fifteen million, one hundred forty thousand, four hundred twenty-two".