21311223203 has 8 divisors (see below), whose sum is σ = 22413753216. Its totient is φ = 20234635200.

The previous prime is 21311223191. The next prime is 21311223223. The reversal of 21311223203 is 30232211312.

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 21311223203 - 2¹⁸ = 21310961059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21311223223) 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, 6483818 + ... + 6487103.

It is an arithmetic number, because the mean of its divisors is an integer number (2801719152).

Almost surely, 2^21311223203 is an apocalyptic number.

21311223203 is a deficient number, since it is larger than the sum of its proper divisors (1102530013).

21311223203 is a wasteful number, since it uses less digits than its factorization.

21311223203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12971005.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 21311223203 its reverse (30232211312), we get a palindrome (51543434515).

The spelling of 21311223203 in words is "twenty-one billion, three hundred eleven million, two hundred twenty-three thousand, two hundred three".