215142421250 has 20 divisors (see below), whose sum is σ = 403262956734. Its totient is φ = 86056968000.

The previous prime is 215142421211. The next prime is 215142421253. The reversal of 215142421250 is 52124241512.

It can be written as a sum of positive squares in 5 ways, for example, as 48693924889 + 166448496361 = 220667^2 + 407981^2 .

It is a super-2 number, since 2×215142421250² (a number of 23 digits) contains 22 as substring.

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 9 ways as a sum of consecutive naturals, for example, 86055719 + ... + 86058218.

Almost surely, 2^215142421250 is an apocalyptic number.

215142421250 is a deficient number, since it is larger than the sum of its proper divisors (188120535484).

215142421250 is an equidigital number, since it uses as much as digits as its factorization.

215142421250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172113959 (or 172113944 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 29.

Adding to 215142421250 its reverse (52124241512), we get a palindrome (267266662762).

The spelling of 215142421250 in words is "two hundred fifteen billion, one hundred forty-two million, four hundred twenty-one thousand, two hundred fifty".