21611241737203 has 16 divisors (see below), whose sum is σ = 22304281962240. Its totient is φ = 20924132340096.

The previous prime is 21611241737117. The next prime is 21611241737221. The reversal of 21611241737203 is 30273714211612.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21611241737203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21611241537203) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6558558 + ... + 9286396.

It is an arithmetic number, because the mean of its divisors is an integer number (1394017622640).

Almost surely, 2^{21611241737203} is an apocalyptic number.

21611241737203 is a deficient number, since it is larger than the sum of its proper divisors (693040225037).

21611241737203 is a wasteful number, since it uses less digits than its factorization.

21611241737203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2728926.

The product of its (nonzero) digits is 84672, while the sum is 40.

Adding to 21611241737203 its reverse (30273714211612), we get a palindrome (51884955948815).

The spelling of 21611241737203 in words is "twenty-one trillion, six hundred eleven billion, two hundred forty-one million, seven hundred thirty-seven thousand, two hundred three".