215155411020 has 144 divisors (see below), whose sum is σ = 712173440160. Its totient is φ = 52143897600.

The previous prime is 215155410949. The next prime is 215155411039. The reversal of 215155411020 is 20114551512.

It is a happy number.

215155411020 is a `hidden beast` number, since 2 + 1 + 5 + 1 + 554 + 1 + 102 + 0 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7884600 + ... + 7911840.

It is an arithmetic number, because the mean of its divisors is an integer number (4945648890).

Almost surely, 2^215155411020 is an apocalyptic number.

215155411020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 215155411020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (356086720080).

215155411020 is an abundant number, since it is smaller than the sum of its proper divisors (497018029140).

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

215155411020 is a wasteful number, since it uses less digits than its factorization.

215155411020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31256 (or 31251 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 27.

Adding to 215155411020 its reverse (20114551512), we get a palindrome (235269962532).

The spelling of 215155411020 in words is "two hundred fifteen billion, one hundred fifty-five million, four hundred eleven thousand, twenty".