2231122021 has 4 divisors (see below), whose sum is σ = 2243448844. Its totient is φ = 2218795200.

The previous prime is 2231121983. The next prime is 2231122073. The reversal of 2231122021 is 1202211322.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1103169796 + 1127952225 = 33214^2 + 33585^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2231122021 is a prime.

It is a super-3 number, since 3×2231122021³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2231121986 and 2231122004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2231123021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6163140 + ... + 6163501.

It is an arithmetic number, because the mean of its divisors is an integer number (560862211).

Almost surely, 2^2231122021 is an apocalyptic number.

It is an amenable number.

2231122021 is a deficient number, since it is larger than the sum of its proper divisors (12326823).

2231122021 is a wasteful number, since it uses less digits than its factorization.

2231122021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12326822.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 2231122021 is about 47234.7543764123. The cubic root of 2231122021 is about 1306.6956366428.

Adding to 2231122021 its reverse (1202211322), we get a palindrome (3433333343).

The spelling of 2231122021 in words is "two billion, two hundred thirty-one million, one hundred twenty-two thousand, twenty-one".