210212121923 has 2 divisors, whose sum is σ = 210212121924. Its totient is φ = 210212121922.

The previous prime is 210212121901. The next prime is 210212122013. The reversal of 210212121923 is 329121212012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 210212121923 - 2¹⁴ = 210212105539 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 210212121892 and 210212121901.

It is not a weakly prime, because it can be changed into another prime (210212121323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105106060961 + 105106060962.

It is an arithmetic number, because the mean of its divisors is an integer number (105106060962).

Almost surely, 2^210212121923 is an apocalyptic number.

210212121923 is a deficient number, since it is larger than the sum of its proper divisors (1).

210212121923 is an equidigital number, since it uses as much as digits as its factorization.

210212121923 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 26.

Adding to 210212121923 its reverse (329121212012), we get a palindrome (539333333935).

The spelling of 210212121923 in words is "two hundred ten billion, two hundred twelve million, one hundred twenty-one thousand, nine hundred twenty-three".