215121352 has 8 divisors (see below), whose sum is σ = 403352550. Its totient is φ = 107560672.

The previous prime is 215121343. The next prime is 215121359. The reversal of 215121352 is 253121512.

It can be written as a sum of positive squares in only one way, i.e., 189172516 + 25948836 = 13754^2 + 5094^2 .

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

It is not an unprimeable number, because it can be changed into a prime (215121359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13445077 + ... + 13445092.

Almost surely, 2^215121352 is an apocalyptic number.

It is an amenable number.

215121352 is a deficient number, since it is larger than the sum of its proper divisors (188231198).

215121352 is a wasteful number, since it uses less digits than its factorization.

215121352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26890175 (or 26890171 counting only the distinct ones).

The product of its digits is 600, while the sum is 22.

The square root of 215121352 is about 14667.0157837237. The cubic root of 215121352 is about 599.1853313961.

Adding to 215121352 its reverse (253121512), we get a palindrome (468242864).

The spelling of 215121352 in words is "two hundred fifteen million, one hundred twenty-one thousand, three hundred fifty-two".