212402645 has 16 divisors (see below), whose sum is σ = 313703040. Its totient is φ = 134443584.

The previous prime is 212402627. The next prime is 212402647. The reversal of 212402645 is 546204212.

It is a cyclic number.

It is not a de Polignac number, because 212402645 - 2⁶ = 212402581 is a prime.

It is a super-2 number, since 2×212402645² = 90229767205992050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212402647) 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, 232955 + ... + 233864.

It is an arithmetic number, because the mean of its divisors is an integer number (19606440).

Almost surely, 2^212402645 is an apocalyptic number.

It is an amenable number.

212402645 is a deficient number, since it is larger than the sum of its proper divisors (101300395).

212402645 is a wasteful number, since it uses less digits than its factorization.

212402645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 466844.

The product of its (nonzero) digits is 3840, while the sum is 26.

The square root of 212402645 is about 14574.0401056124. The cubic root of 212402645 is about 596.6504514110.

Adding to 212402645 its reverse (546204212), we get a palindrome (758606857).

The spelling of 212402645 in words is "two hundred twelve million, four hundred two thousand, six hundred forty-five".