21322031 has 2 divisors, whose sum is σ = 21322032. Its totient is φ = 21322030.

The previous prime is 21322019. The next prime is 21322043. The reversal of 21322031 is 13022312.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (21322019) and next prime (21322043).

It is a cyclic number.

It is not a de Polignac number, because 21322031 - 2⁶ = 21321967 is a prime.

It is a super-2 number, since 2×21322031² = 909258011929922, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 21321997 and 21322015.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21322051) 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 as a sum of consecutive naturals, namely, 10661015 + 10661016.

It is an arithmetic number, because the mean of its divisors is an integer number (10661016).

Almost surely, 2^21322031 is an apocalyptic number.

21322031 is a deficient number, since it is larger than the sum of its proper divisors (1).

21322031 is an equidigital number, since it uses as much as digits as its factorization.

21322031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 21322031 is about 4617.5784779471. The cubic root of 21322031 is about 277.2955223366.

Adding to 21322031 its reverse (13022312), we get a palindrome (34344343).

The spelling of 21322031 in words is "twenty-one million, three hundred twenty-two thousand, thirty-one".