21320221122037 has 2 divisors, whose sum is σ = 21320221122038. Its totient is φ = 21320221122036.

The previous prime is 21320221122017. The next prime is 21320221122107. The reversal of 21320221122037 is 73022112202312.

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., 21287602594801 + 32618527236 = 4613849^2 + 180606^2 .

It is a cyclic number.

It is not a de Polignac number, because 21320221122037 - 2⁷ = 21320221121909 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21320221121996 and 21320221122014.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21320221122017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10660110561018 + 10660110561019.

It is an arithmetic number, because the mean of its divisors is an integer number (10660110561019).

Almost surely, 2^{21320221122037} is an apocalyptic number.

It is an amenable number.

21320221122037 is a deficient number, since it is larger than the sum of its proper divisors (1).

21320221122037 is an equidigital number, since it uses as much as digits as its factorization.

21320221122037 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 28.

Adding to 21320221122037 its reverse (73022112202312), we get a palindrome (94342333324349).

The spelling of 21320221122037 in words is "twenty-one trillion, three hundred twenty billion, two hundred twenty-one million, one hundred twenty-two thousand, thirty-seven".