2311022221221 has 32 divisors (see below), whose sum is σ = 3617969080320. Its totient is φ = 1284454207296.

The previous prime is 2311022221181. The next prime is 2311022221223. The reversal of 2311022221221 is 1221222201132.

It is not a de Polignac number, because 2311022221221 - 2¹³ = 2311022213029 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2311022221223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1777600 + ... + 2789606.

It is an arithmetic number, because the mean of its divisors is an integer number (113061533760).

Almost surely, 2^{2311022221221} is an apocalyptic number.

2311022221221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2311022221221 is a deficient number, since it is larger than the sum of its proper divisors (1306946859099).

2311022221221 is a wasteful number, since it uses less digits than its factorization.

2311022221221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1014993.

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

Adding to 2311022221221 its reverse (1221222201132), we get a palindrome (3532244422353).

The spelling of 2311022221221 in words is "two trillion, three hundred eleven billion, twenty-two million, two hundred twenty-one thousand, two hundred twenty-one".