21252044111603 has 8 divisors (see below), whose sum is σ = 22502768671872. Its totient is φ = 20001386697856.

The previous prime is 21252044111549. The next prime is 21252044111621. The reversal of 21252044111603 is 30611144025212.

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 21252044111603 - 2²² = 21252039917299 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21252044111603.

It is not an unprimeable number, because it can be changed into a prime (21252044111653) 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, 16134275 + ... + 17401692.

It is an arithmetic number, because the mean of its divisors is an integer number (2812846083984).

Almost surely, 2^{21252044111603} is an apocalyptic number.

21252044111603 is a deficient number, since it is larger than the sum of its proper divisors (1250724560269).

21252044111603 is a wasteful number, since it uses less digits than its factorization.

21252044111603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33573261.

The product of its (nonzero) digits is 11520, while the sum is 32.

Adding to 21252044111603 its reverse (30611144025212), we get a palindrome (51863188136815).

The spelling of 21252044111603 in words is "twenty-one trillion, two hundred fifty-two billion, forty-four million, one hundred eleven thousand, six hundred three".