215421652 has 12 divisors (see below), whose sum is σ = 381224340. Its totient is φ = 106500416.

The previous prime is 215421649. The next prime is 215421653. The reversal of 215421652 is 256124512.

215421652 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 81649296 + 133772356 = 9036^2 + 11566^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 215421652.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215421653) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 302203 + ... + 302914.

It is an arithmetic number, because the mean of its divisors is an integer number (31768695).

Almost surely, 2^215421652 is an apocalyptic number.

It is an amenable number.

215421652 is a deficient number, since it is larger than the sum of its proper divisors (165802688).

215421652 is a wasteful number, since it uses less digits than its factorization.

215421652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 605210 (or 605208 counting only the distinct ones).

The product of its digits is 4800, while the sum is 28.

The square root of 215421652 is about 14677.2494698428. The cubic root of 215421652 is about 599.4640139334.

The spelling of 215421652 in words is "two hundred fifteen million, four hundred twenty-one thousand, six hundred fifty-two".