215221352 has 8 divisors (see below), whose sum is σ = 403540050. Its totient is φ = 107610672.

The previous prime is 215221339. The next prime is 215221367. The reversal of 215221352 is 253122512.

It can be written as a sum of positive squares in only one way, i.e., 214739716 + 481636 = 14654^2 + 694^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13451327 + ... + 13451342.

Almost surely, 2^215221352 is an apocalyptic number.

It is an amenable number.

215221352 is a deficient number, since it is larger than the sum of its proper divisors (188318698).

215221352 is a wasteful number, since it uses less digits than its factorization.

215221352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26902675 (or 26902671 counting only the distinct ones).

The product of its digits is 1200, while the sum is 23.

The square root of 215221352 is about 14670.4243974058. The cubic root of 215221352 is about 599.2781615600.

Adding to 215221352 its reverse (253122512), we get a palindrome (468343864).

The spelling of 215221352 in words is "two hundred fifteen million, two hundred twenty-one thousand, three hundred fifty-two".