21210100011097 has 4 divisors (see below), whose sum is σ = 21210110426340. Its totient is φ = 21210089595856.

The previous prime is 21210100011077. The next prime is 21210100011103. The reversal of 21210100011097 is 79011000101212.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 10940773443856 + 10269326567241 = 3307684^2 + 3204579^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21210100011097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21210100011077) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1042522 + ... + 6595987.

It is an arithmetic number, because the mean of its divisors is an integer number (5302527606585).

Almost surely, 2^{21210100011097} is an apocalyptic number.

It is an amenable number.

21210100011097 is a deficient number, since it is larger than the sum of its proper divisors (10415243).

21210100011097 is an equidigital number, since it uses as much as digits as its factorization.

21210100011097 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10415242.

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

The spelling of 21210100011097 in words is "twenty-one trillion, two hundred ten billion, one hundred million, eleven thousand, ninety-seven".