212121003 has 16 divisors (see below), whose sum is σ = 299077632. Its totient is φ = 133512000.

The previous prime is 212120983. The next prime is 212121023. The reversal of 212121003 is 300121212.

It is an interprime number because it is at equal distance from previous prime (212120983) and next prime (212121023).

It is not a de Polignac number, because 212121003 - 2¹⁷ = 211989931 is a prime.

It is a super-3 number, since 3×212121003³ (a number of 26 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 212121003.

It is not an unprimeable number, because it can be changed into a prime (212121023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24003 + ... + 31628.

It is an arithmetic number, because the mean of its divisors is an integer number (18692352).

Almost surely, 2^212121003 is an apocalyptic number.

212121003 is a deficient number, since it is larger than the sum of its proper divisors (86956629).

212121003 is a wasteful number, since it uses less digits than its factorization.

212121003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55706.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 212121003 is about 14564.3744458868. The cubic root of 212121003 is about 596.3866189233.

Adding to 212121003 its reverse (300121212), we get a palindrome (512242215).

The spelling of 212121003 in words is "two hundred twelve million, one hundred twenty-one thousand, three".