215420220000 has 360 divisors, whose sum is σ = 768411123480. Its totient is φ = 57227520000.

The previous prime is 215420219981. The next prime is 215420220011. The reversal of 215420220000 is 22024512.

215420220000 is a `hidden beast` number, since 21 + 5 + 420 + 220 + 0 + 0 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (360).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 50577871 + ... + 50582129.

It is an arithmetic number, because the mean of its divisors is an integer number (2134475343).

Almost surely, 2^215420220000 is an apocalyptic number.

215420220000 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 215420220000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (384205561740).

215420220000 is an abundant number, since it is smaller than the sum of its proper divisors (552990903480).

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

215420220000 is a wasteful number, since it uses less digits than its factorization.

215420220000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4576 (or 4550 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

Adding to 215420220000 its reverse (22024512), we get a palindrome (215442244512).

The spelling of 215420220000 in words is "two hundred fifteen billion, four hundred twenty million, two hundred twenty thousand".