215420201100 has 216 divisors, whose sum is σ = 758779580832. Its totient is φ = 50720947200.

The previous prime is 215420201081. The next prime is 215420201111. The reversal of 215420201100 is 1102024512.

215420201100 is a `hidden beast` number, since 2 + 1 + 542 + 0 + 20 + 1 + 100 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 131161 + ... + 669360.

Almost surely, 2^215420201100 is an apocalyptic number.

215420201100 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 215420201100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (379389790416).

215420201100 is an abundant number, since it is smaller than the sum of its proper divisors (543359379732).

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

215420201100 is a wasteful number, since it uses less digits than its factorization.

215420201100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 800577 (or 800567 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

Adding to 215420201100 its reverse (1102024512), we get a palindrome (216522225612).

The spelling of 215420201100 in words is "two hundred fifteen billion, four hundred twenty million, two hundred one thousand, one hundred".