2231021021 has 16 divisors (see below), whose sum is σ = 2363174400. Its totient is φ = 2100394800.

The previous prime is 2231020997. The next prime is 2231021033. The reversal of 2231021021 is 1201201322.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 2231021021 - 2¹⁴ = 2231004637 is a prime.

It is a super-3 number, since 3×2231021021³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2231020987 and 2231021005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2231021041) 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 15 ways as a sum of consecutive naturals, for example, 3535376 + ... + 3536006.

It is an arithmetic number, because the mean of its divisors is an integer number (147698400).

Almost surely, 2^2231021021 is an apocalyptic number.

It is an amenable number.

2231021021 is a deficient number, since it is larger than the sum of its proper divisors (132153379).

2231021021 is a wasteful number, since it uses less digits than its factorization.

2231021021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1520.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 2231021021 is about 47233.6852362803. The cubic root of 2231021021 is about 1306.6759188731.

Adding to 2231021021 its reverse (1201201322), we get a palindrome (3432222343).

The spelling of 2231021021 in words is "two billion, two hundred thirty-one million, twenty-one thousand, twenty-one".