210133681 has 16 divisors (see below), whose sum is σ = 227784960. Its totient is φ = 193251520.

The previous prime is 210133669. The next prime is 210133709. The reversal of 210133681 is 186331012.

It is not a de Polignac number, because 210133681 - 2⁹ = 210133169 is a prime.

It is a super-2 number, since 2×210133681² = 88312327781219522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (210133661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 206931 + ... + 207943.

It is an arithmetic number, because the mean of its divisors is an integer number (14236560).

Almost surely, 2^210133681 is an apocalyptic number.

It is an amenable number.

210133681 is a deficient number, since it is larger than the sum of its proper divisors (17651279).

210133681 is a wasteful number, since it uses less digits than its factorization.

210133681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1376.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 210133681 is about 14495.9884450837. The cubic root of 210133681 is about 594.5182938294.

Adding to 210133681 its reverse (186331012), we get a palindrome (396464693).

The spelling of 210133681 in words is "two hundred ten million, one hundred thirty-three thousand, six hundred eighty-one".