212321807 has 2 divisors, whose sum is σ = 212321808. Its totient is φ = 212321806.

The previous prime is 212321803. The next prime is 212321819. The reversal of 212321807 is 708123212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 212321807 - 2² = 212321803 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212321803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106160903 + 106160904.

It is an arithmetic number, because the mean of its divisors is an integer number (106160904).

Almost surely, 2^212321807 is an apocalyptic number.

212321807 is a deficient number, since it is larger than the sum of its proper divisors (1).

212321807 is an equidigital number, since it uses as much as digits as its factorization.

212321807 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 212321807 is about 14571.2664857932. The cubic root of 212321807 is about 596.5747490433.

The spelling of 212321807 in words is "two hundred twelve million, three hundred twenty-one thousand, eight hundred seven".