1212222321021 has 16 divisors (see below), whose sum is σ = 1684755948224. Its totient is φ = 774570449664.

The previous prime is 1212222320977. The next prime is 1212222321043. The reversal of 1212222321021 is 1201232222121.

It is not a de Polignac number, because 1212222321021 - 2¹⁸ = 1212222058877 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212222321721) 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, 81491980 + ... + 81506853.

It is an arithmetic number, because the mean of its divisors is an integer number (105297246764).

Almost surely, 2^{1212222321021} is an apocalyptic number.

It is an amenable number.

1212222321021 is a deficient number, since it is larger than the sum of its proper divisors (472533627203).

1212222321021 is a wasteful number, since it uses less digits than its factorization.

1212222321021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162998940.

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 1212222321021 its reverse (1201232222121), we get a palindrome (2413454543142).

The spelling of 1212222321021 in words is "one trillion, two hundred twelve billion, two hundred twenty-two million, three hundred twenty-one thousand, twenty-one".