215134209700 has 72 divisors (see below), whose sum is σ = 480140666600. Its totient is φ = 83608796160.

The previous prime is 215134209691. The next prime is 215134209709. The reversal of 215134209700 is 7902431512.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (215134209691) and next prime (215134209709).

It can be written as a sum of positive squares in 12 ways, for example, as 10062898596 + 205071311104 = 100314^2 + 452848^2 .

It is not an unprimeable number, because it can be changed into a prime (215134209709) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2582296 + ... + 2664304.

Almost surely, 2^215134209700 is an apocalyptic number.

215134209700 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 215134209700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (240070333300).

215134209700 is an abundant number, since it is smaller than the sum of its proper divisors (265006456900).

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

215134209700 is a wasteful number, since it uses less digits than its factorization.

215134209700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82769 (or 82762 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 34.

The spelling of 215134209700 in words is "two hundred fifteen billion, one hundred thirty-four million, two hundred nine thousand, seven hundred".