2231212021 has 2 divisors, whose sum is σ = 2231212022. Its totient is φ = 2231212020.

The previous prime is 2231212013. The next prime is 2231212069. The reversal of 2231212021 is 1202121322.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1924576900 + 306635121 = 43870^2 + 17511^2 .

It is a cyclic number.

It is not a de Polignac number, because 2231212021 - 2³ = 2231212013 is a prime.

It is a super-3 number, since 3×2231212021³ (a number of 29 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2231211986 and 2231212004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2231213021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1115606010 + 1115606011.

It is an arithmetic number, because the mean of its divisors is an integer number (1115606011).

Almost surely, 2^2231212021 is an apocalyptic number.

It is an amenable number.

2231212021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2231212021 is an equidigital number, since it uses as much as digits as its factorization.

2231212021 is an evil number, because the sum of its binary digits is even.

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

The square root of 2231212021 is about 47235.7070551506. The cubic root of 2231212021 is about 1306.7132064313.

Adding to 2231212021 its reverse (1202121322), we get a palindrome (3433333343).

The spelling of 2231212021 in words is "two billion, two hundred thirty-one million, two hundred twelve thousand, twenty-one".