212140387 has 2 divisors, whose sum is σ = 212140388. Its totient is φ = 212140386.

The previous prime is 212140373. The next prime is 212140391. The reversal of 212140387 is 783041212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 212140387 - 2¹⁵ = 212107619 is a prime.

It is not a weakly prime, because it can be changed into another prime (212140337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106070193 + 106070194.

It is an arithmetic number, because the mean of its divisors is an integer number (106070194).

Almost surely, 2^212140387 is an apocalyptic number.

212140387 is a deficient number, since it is larger than the sum of its proper divisors (1).

212140387 is an equidigital number, since it uses as much as digits as its factorization.

212140387 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 212140387 is about 14565.0398900930. The cubic root of 212140387 is about 596.4047846651.

Adding to 212140387 its reverse (783041212), we get a palindrome (995181599).

The spelling of 212140387 in words is "two hundred twelve million, one hundred forty thousand, three hundred eighty-seven".