215420210120 has 16 divisors (see below), whose sum is σ = 484695472860. Its totient is φ = 86168084032.

The previous prime is 215420210039. The next prime is 215420210183. The reversal of 215420210120 is 21012024512.

It can be written as a sum of positive squares in 2 ways, for example, as 209677904836 + 5742305284 = 457906^2 + 75778^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 215420210092 and 215420210101.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2692752587 + ... + 2692752666.

Almost surely, 2^215420210120 is an apocalyptic number.

215420210120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

215420210120 is an abundant number, since it is smaller than the sum of its proper divisors (269275262740).

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

215420210120 is a wasteful number, since it uses less digits than its factorization.

215420210120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5385505264 (or 5385505260 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 20.

Adding to 215420210120 its reverse (21012024512), we get a palindrome (236432234632).

The spelling of 215420210120 in words is "two hundred fifteen billion, four hundred twenty million, two hundred ten thousand, one hundred twenty".