21202221121969 has 2 divisors, whose sum is σ = 21202221121970. Its totient is φ = 21202221121968.

The previous prime is 21202221121957. The next prime is 21202221121987. The reversal of 21202221121969 is 96912112220212.

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., 16731470329744 + 4470750792225 = 4090412^2 + 2114415^2 .

It is a cyclic number.

It is not a de Polignac number, because 21202221121969 - 2¹¹ = 21202221119921 is a prime.

It is a super-2 number, since 2×21202221121969² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21202221121769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10601110560984 + 10601110560985.

It is an arithmetic number, because the mean of its divisors is an integer number (10601110560985).

Almost surely, 2^{21202221121969} is an apocalyptic number.

It is an amenable number.

21202221121969 is a deficient number, since it is larger than the sum of its proper divisors (1).

21202221121969 is an equidigital number, since it uses as much as digits as its factorization.

21202221121969 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 40.

The spelling of 21202221121969 in words is "twenty-one trillion, two hundred two billion, two hundred twenty-one million, one hundred twenty-one thousand, nine hundred sixty-nine".