21100340269 has 2 divisors, whose sum is σ = 21100340270. Its totient is φ = 21100340268.

The previous prime is 21100340221. The next prime is 21100340293. The reversal of 21100340269 is 96204300112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14979312100 + 6121028169 = 122390^2 + 78237^2 .

It is a cyclic number.

It is not a de Polignac number, because 21100340269 - 2⁷ = 21100340141 is a prime.

It is a super-2 number, since 2×21100340269² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21100343269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550170134 + 10550170135.

It is an arithmetic number, because the mean of its divisors is an integer number (10550170135).

Almost surely, 2^21100340269 is an apocalyptic number.

It is an amenable number.

21100340269 is a deficient number, since it is larger than the sum of its proper divisors (1).

21100340269 is an equidigital number, since it uses as much as digits as its factorization.

21100340269 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 28.

The spelling of 21100340269 in words is "twenty-one billion, one hundred million, three hundred forty thousand, two hundred sixty-nine".