215142421255 has 16 divisors (see below), whose sum is σ = 266960980224. Its totient is φ = 166273136640.

The previous prime is 215142421253. The next prime is 215142421301. The reversal of 215142421255 is 552124241512.

It is not a de Polignac number, because 215142421255 - 2¹ = 215142421253 is a prime.

It is a super-2 number, since 2×215142421255² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 215142421255.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215142421253) 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, 1113352 + ... + 1292221.

It is an arithmetic number, because the mean of its divisors is an integer number (16685061264).

Almost surely, 2^215142421255 is an apocalyptic number.

215142421255 is a deficient number, since it is larger than the sum of its proper divisors (51818558969).

215142421255 is a wasteful number, since it uses less digits than its factorization.

215142421255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2406186.

The product of its digits is 32000, while the sum is 34.

Adding to 215142421255 its reverse (552124241512), we get a palindrome (767266662767).

The spelling of 215142421255 in words is "two hundred fifteen billion, one hundred forty-two million, four hundred twenty-one thousand, two hundred fifty-five".