21123661143203 has 8 divisors (see below), whose sum is σ = 21375646635600. Its totient is φ = 20872001006208.

The previous prime is 21123661143187. The next prime is 21123661143227. The reversal of 21123661143203 is 30234116632112.

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 21123661143203 - 2⁴ = 21123661143187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21123661143253) 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, 81208226 + ... + 81467927.

It is an arithmetic number, because the mean of its divisors is an integer number (2671955829450).

Almost surely, 2^{21123661143203} is an apocalyptic number.

21123661143203 is a deficient number, since it is larger than the sum of its proper divisors (251985492397).

21123661143203 is a wasteful number, since it uses less digits than its factorization.

21123661143203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162677701.

The product of its (nonzero) digits is 31104, while the sum is 35.

Adding to 21123661143203 its reverse (30234116632112), we get a palindrome (51357777775315).

The spelling of 21123661143203 in words is "twenty-one trillion, one hundred twenty-three billion, six hundred sixty-one million, one hundred forty-three thousand, two hundred three".