21113111203297 has 4 divisors (see below), whose sum is σ = 22355058921156. Its totient is φ = 19871163485440.

The previous prime is 21113111203291. The next prime is 21113111203307. The reversal of 21113111203297 is 79230211131112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16705865972961 + 4407245230336 = 4087281^2 + 2099344^2 .

It is a cyclic number.

It is not a de Polignac number, because 21113111203297 - 2⁴³ = 12317018181089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21113111203291) 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, 620973858904 + ... + 620973858937.

It is an arithmetic number, because the mean of its divisors is an integer number (5588764730289).

Almost surely, 2^{21113111203297} is an apocalyptic number.

It is an amenable number.

21113111203297 is a deficient number, since it is larger than the sum of its proper divisors (1241947717859).

21113111203297 is a wasteful number, since it uses less digits than its factorization.

21113111203297 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1241947717858.

The product of its (nonzero) digits is 4536, while the sum is 34.

The spelling of 21113111203297 in words is "twenty-one trillion, one hundred thirteen billion, one hundred eleven million, two hundred three thousand, two hundred ninety-seven".