2231421421 has 4 divisors (see below), whose sum is σ = 2239477372. Its totient is φ = 2223365472.

The previous prime is 2231421391. The next prime is 2231421431. The reversal of 2231421421 is 1241241322.

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 209120521 + 2022300900 = 14461^2 + 44970^2 .

It is a cyclic number.

It is not a de Polignac number, because 2231421421 - 2⁷ = 2231421293 is a prime.

It is a super-3 number, since 3×2231421421³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2231421392 and 2231421401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2231421431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4027560 + ... + 4028113.

It is an arithmetic number, because the mean of its divisors is an integer number (559869343).

Almost surely, 2^2231421421 is an apocalyptic number.

It is an amenable number.

2231421421 is a deficient number, since it is larger than the sum of its proper divisors (8055951).

2231421421 is an equidigital number, since it uses as much as digits as its factorization.

2231421421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8055950.

The product of its digits is 768, while the sum is 22.

The square root of 2231421421 is about 47237.9235466590. The cubic root of 2231421421 is about 1306.7540836441.

Adding to 2231421421 its reverse (1241241322), we get a palindrome (3472662743).

The spelling of 2231421421 in words is "two billion, two hundred thirty-one million, four hundred twenty-one thousand, four hundred twenty-one".