215421696 has 324 divisors, whose sum is σ = 769418832. Its totient is φ = 56733696.

The previous prime is 215421691. The next prime is 215421707. The reversal of 215421696 is 696124512.

215421696 is a `hidden beast` number, since 21 + 542 + 1 + 6 + 96 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 215421696.

It is not an unprimeable number, because it can be changed into a prime (215421691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 5822190 + ... + 5822226.

Almost surely, 2^215421696 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 215421696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (384709416).

215421696 is an abundant number, since it is smaller than the sum of its proper divisors (553997136).

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

215421696 is a wasteful number, since it uses less digits than its factorization.

215421696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104 (or 68 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 215421696 is about 14677.2509687611. The cubic root of 215421696 is about 599.4640547470.

The spelling of 215421696 in words is "two hundred fifteen million, four hundred twenty-one thousand, six hundred ninety-six".