212146507 has 4 divisors (see below), whose sum is σ = 212182920. Its totient is φ = 212110096.

The previous prime is 212146489. The next prime is 212146523. The reversal of 212146507 is 705641212.

It is a semiprime because it is the product of two primes.

It is a 4-Lehmer number, since φ(212146507) divides (212146507-1)⁴.

It is a cyclic number.

It is not a de Polignac number, because 212146507 - 2⁷ = 212146379 is a prime.

It is a super-2 number, since 2×212146507² = 90012280864602098, which contains 22 as substring.

It is a deceptive number, since it divides R_212146506.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212146607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7282 + ... + 21847.

It is an arithmetic number, because the mean of its divisors is an integer number (53045730).

Almost surely, 2^212146507 is an apocalyptic number.

212146507 is the 7283-rd decagonal number.

212146507 is a deficient number, since it is larger than the sum of its proper divisors (36413).

212146507 is an equidigital number, since it uses as much as digits as its factorization.

212146507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36412.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 212146507 is about 14565.2499806903. The cubic root of 212146507 is about 596.4105198015.

Adding to 212146507 its reverse (705641212), we get a palindrome (917787719).

The spelling of 212146507 in words is "two hundred twelve million, one hundred forty-six thousand, five hundred seven".