212136451 has 2 divisors, whose sum is σ = 212136452. Its totient is φ = 212136450.

The previous prime is 212136443. The next prime is 212136469. The reversal of 212136451 is 154631212.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 212136451 - 2³ = 212136443 is a prime.

It is not a weakly prime, because it can be changed into another prime (212136401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106068225 + 106068226.

It is an arithmetic number, because the mean of its divisors is an integer number (106068226).

Almost surely, 2^212136451 is an apocalyptic number.

212136451 is a deficient number, since it is larger than the sum of its proper divisors (1).

212136451 is an equidigital number, since it uses as much as digits as its factorization.

212136451 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1440, while the sum is 25.

The square root of 212136451 is about 14564.9047714017. The cubic root of 212136451 is about 596.4010961269.

Adding to 212136451 its reverse (154631212), we get a palindrome (366767663).

The spelling of 212136451 in words is "two hundred twelve million, one hundred thirty-six thousand, four hundred fifty-one".