212121023 has 2 divisors, whose sum is σ = 212121024. Its totient is φ = 212121022.

The previous prime is 212120983. The next prime is 212121029. The reversal of 212121023 is 320121212.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212121023 is a prime.

It is a super-3 number, since 3×212121023³ (a number of 26 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 212120989 and 212121007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212121029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106060511 + 106060512.

It is an arithmetic number, because the mean of its divisors is an integer number (106060512).

Almost surely, 2^212121023 is an apocalyptic number.

212121023 is a deficient number, since it is larger than the sum of its proper divisors (1).

212121023 is an equidigital number, since it uses as much as digits as its factorization.

212121023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 212121023 is about 14564.3751324937. The cubic root of 212121023 is about 596.3866376669.

Adding to 212121023 its reverse (320121212), we get a palindrome (532242235).

The spelling of 212121023 in words is "two hundred twelve million, one hundred twenty-one thousand, twenty-three".