31221141421 has 4 divisors (see below), whose sum is σ = 32064956092. Its totient is φ = 30377326752.

The previous prime is 31221141401. The next prime is 31221141433. The reversal of 31221141421 is 12414112213.

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 29215355625 + 2005785796 = 170925^2 + 44786^2 .

It is a cyclic number.

It is not a de Polignac number, because 31221141421 - 2¹¹ = 31221139373 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31221141392 and 31221141401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31221141401) 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, 421907280 + ... + 421907353.

It is an arithmetic number, because the mean of its divisors is an integer number (8016239023).

Almost surely, 2^31221141421 is an apocalyptic number.

It is an amenable number.

31221141421 is a deficient number, since it is larger than the sum of its proper divisors (843814671).

31221141421 is an equidigital number, since it uses as much as digits as its factorization.

31221141421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 843814670.

The product of its digits is 384, while the sum is 22.

Adding to 31221141421 its reverse (12414112213), we get a palindrome (43635253634).

The spelling of 31221141421 in words is "thirty-one billion, two hundred twenty-one million, one hundred forty-one thousand, four hundred twenty-one".