212121031303321 has 16 divisors (see below), whose sum is σ = 253029865814784. Its totient is φ = 173867757712704.

The previous prime is 212121031303267. The next prime is 212121031303327. The reversal of 212121031303321 is 123303130121212.

It is a cyclic number.

It is not a de Polignac number, because 212121031303321 - 2¹⁷ = 212121031172249 is a prime.

It is a super-3 number, since 3×212121031303321³ (a number of 44 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212121031303327) 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, 170353186 + ... + 171593851.

It is an arithmetic number, because the mean of its divisors is an integer number (15814366613424).

Almost surely, 2^{212121031303321} is an apocalyptic number.

It is an amenable number.

212121031303321 is a deficient number, since it is larger than the sum of its proper divisors (40908834511463).

212121031303321 is a wasteful number, since it uses less digits than its factorization.

212121031303321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 341950920.

The product of its (nonzero) digits is 1296, while the sum is 25.

Adding to 212121031303321 its reverse (123303130121212), we get a palindrome (335424161424533).

The spelling of 212121031303321 in words is "two hundred twelve trillion, one hundred twenty-one billion, thirty-one million, three hundred three thousand, three hundred twenty-one".