21020022112321 has 2 divisors, whose sum is σ = 21020022112322. Its totient is φ = 21020022112320.

The previous prime is 21020022112307. The next prime is 21020022112333. The reversal of 21020022112321 is 12321122002012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13904657921025 + 7115364191296 = 3728895^2 + 2667464^2 .

It is a cyclic number.

It is not a de Polignac number, because 21020022112321 - 2³⁵ = 20985662373953 is a prime.

It is not a weakly prime, because it can be changed into another prime (21020022112381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10510011056160 + 10510011056161.

It is an arithmetic number, because the mean of its divisors is an integer number (10510011056161).

Almost surely, 2^{21020022112321} is an apocalyptic number.

It is an amenable number.

21020022112321 is a deficient number, since it is larger than the sum of its proper divisors (1).

21020022112321 is an equidigital number, since it uses as much as digits as its factorization.

21020022112321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 21020022112321 its reverse (12321122002012), we get a palindrome (33341144114333).

The spelling of 21020022112321 in words is "twenty-one trillion, twenty billion, twenty-two million, one hundred twelve thousand, three hundred twenty-one".