21211110167353 has 2 divisors, whose sum is σ = 21211110167354. Its totient is φ = 21211110167352.

The previous prime is 21211110167323. The next prime is 21211110167389. The reversal of 21211110167353 is 35376101111212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14718057033744 + 6493053133609 = 3836412^2 + 2548147^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21211110167353 is a prime.

It is a super-2 number, since 2×21211110167353² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21211110167323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605555083676 + 10605555083677.

It is an arithmetic number, because the mean of its divisors is an integer number (10605555083677).

Almost surely, 2^{21211110167353} is an apocalyptic number.

It is an amenable number.

21211110167353 is a deficient number, since it is larger than the sum of its proper divisors (1).

21211110167353 is an equidigital number, since it uses as much as digits as its factorization.

21211110167353 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7560, while the sum is 34.

Adding to 21211110167353 its reverse (35376101111212), we get a palindrome (56587211278565).

The spelling of 21211110167353 in words is "twenty-one trillion, two hundred eleven billion, one hundred ten million, one hundred sixty-seven thousand, three hundred fifty-three".