21123430310203 has 16 divisors (see below), whose sum is σ = 22875508577376. Its totient is φ = 19389537630720.

The previous prime is 21123430310167. The next prime is 21123430310309. The reversal of 21123430310203 is 30201303432112.

It is a cyclic number.

It is not a de Polignac number, because 21123430310203 - 2⁹ = 21123430309691 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21123430310503) 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, 36117876 + ... + 36698062.

It is an arithmetic number, because the mean of its divisors is an integer number (1429719286086).

Almost surely, 2^{21123430310203} is an apocalyptic number.

21123430310203 is a deficient number, since it is larger than the sum of its proper divisors (1752078267173).

21123430310203 is a wasteful number, since it uses less digits than its factorization.

21123430310203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 595854.

The product of its (nonzero) digits is 2592, while the sum is 25.

Adding to 21123430310203 its reverse (30201303432112), we get a palindrome (51324733742315).

The spelling of 21123430310203 in words is "twenty-one trillion, one hundred twenty-three billion, four hundred thirty million, three hundred ten thousand, two hundred three".