212106451 has 2 divisors, whose sum is σ = 212106452. Its totient is φ = 212106450.

The previous prime is 212106449. The next prime is 212106457. The reversal of 212106451 is 154601212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 212106451 - 2¹ = 212106449 is a prime.

Together with 212106449, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (212106457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106053225 + 106053226.

It is an arithmetic number, because the mean of its divisors is an integer number (106053226).

Almost surely, 2^212106451 is an apocalyptic number.

212106451 is a deficient number, since it is larger than the sum of its proper divisors (1).

212106451 is an equidigital number, since it uses as much as digits as its factorization.

212106451 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 212106451 is about 14563.8748621375. The cubic root of 212106451 is about 596.3729807696.

Adding to 212106451 its reverse (154601212), we get a palindrome (366707663).

The spelling of 212106451 in words is "two hundred twelve million, one hundred six thousand, four hundred fifty-one".