21113202503447 has 8 divisors (see below), whose sum is σ = 21464763205920. Its totient is φ = 20761817369760.

The previous prime is 21113202503423. The next prime is 21113202503501. The reversal of 21113202503447 is 74430520231112.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21113202503447 - 2³⁰ = 21112128761623 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21113202503417) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43649672 + ... + 44130717.

It is an arithmetic number, because the mean of its divisors is an integer number (2683095400740).

Almost surely, 2^{21113202503447} is an apocalyptic number.

21113202503447 is a deficient number, since it is larger than the sum of its proper divisors (351560702473).

21113202503447 is an equidigital number, since it uses as much as digits as its factorization.

21113202503447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87784393.

The product of its (nonzero) digits is 40320, while the sum is 35.

Adding to 21113202503447 its reverse (74430520231112), we get a palindrome (95543722734559).

The spelling of 21113202503447 in words is "twenty-one trillion, one hundred thirteen billion, two hundred two million, five hundred three thousand, four hundred forty-seven".