21100221101269 has 2 divisors, whose sum is σ = 21100221101270. Its totient is φ = 21100221101268.

The previous prime is 21100221101207. The next prime is 21100221101339. The reversal of 21100221101269 is 96210112200112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18124492600369 + 2975728500900 = 4257287^2 + 1725030^2 .

It is a cyclic number.

It is not a de Polignac number, because 21100221101269 - 2¹⁷ = 21100220970197 is a prime.

It is a super-2 number, since 2×21100221101269² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21100221141269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550110550634 + 10550110550635.

It is an arithmetic number, because the mean of its divisors is an integer number (10550110550635).

Almost surely, 2^{21100221101269} is an apocalyptic number.

It is an amenable number.

21100221101269 is a deficient number, since it is larger than the sum of its proper divisors (1).

21100221101269 is an equidigital number, since it uses as much as digits as its factorization.

21100221101269 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 28.

The spelling of 21100221101269 in words is "twenty-one trillion, one hundred billion, two hundred twenty-one million, one hundred one thousand, two hundred sixty-nine".