215251089228 has 192 divisors, whose sum is σ = 659043840000. Its totient is φ = 60721000704.

The previous prime is 215251089199. The next prime is 215251089257. The reversal of 215251089228 is 822980152512.

215251089228 is a `hidden beast` number, since 2 + 1 + 52 + 510 + 89 + 2 + 2 + 8 = 666.

It is an interprime number because it is at equal distance from previous prime (215251089199) and next prime (215251089257).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2889700 + ... + 2963252.

It is an arithmetic number, because the mean of its divisors is an integer number (3432520000).

Almost surely, 2^215251089228 is an apocalyptic number.

215251089228 is a gapful number since it is divisible by the number (28) 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 215251089228, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (329521920000).

215251089228 is an abundant number, since it is smaller than the sum of its proper divisors (443792750772).

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

215251089228 is a wasteful number, since it uses less digits than its factorization.

215251089228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73666 (or 73644 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 45.

The spelling of 215251089228 in words is "two hundred fifteen billion, two hundred fifty-one million, eighty-nine thousand, two hundred twenty-eight".