21102111097 has 2 divisors, whose sum is σ = 21102111098. Its totient is φ = 21102111096.

The previous prime is 21102111083. The next prime is 21102111103. The reversal of 21102111097 is 79011120112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11820908176 + 9281202921 = 108724^2 + 96339^2 .

It is a cyclic number.

It is not a de Polignac number, because 21102111097 - 2⁷ = 21102110969 is a prime.

It is not a weakly prime, because it can be changed into another prime (21102111007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10551055548 + 10551055549.

It is an arithmetic number, because the mean of its divisors is an integer number (10551055549).

Almost surely, 2^21102111097 is an apocalyptic number.

It is an amenable number.

21102111097 is a deficient number, since it is larger than the sum of its proper divisors (1).

21102111097 is an equidigital number, since it uses as much as digits as its factorization.

21102111097 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 252, while the sum is 25.

The spelling of 21102111097 in words is "twenty-one billion, one hundred two million, one hundred eleven thousand, ninety-seven".