21131001013203 has 6 divisors (see below), whose sum is σ = 30522557019084. Its totient is φ = 14087334008796.

The previous prime is 21131001013169. The next prime is 21131001013223. The reversal of 21131001013203 is 30231010013112.

21131001013203 is a `hidden beast` number, since 21 + 1 + 310 + 0 + 10 + 1 + 320 + 3 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-21131001013203 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21131001013223) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1173944500725 + ... + 1173944500742.

It is an arithmetic number, because the mean of its divisors is an integer number (5087092836514).

Almost surely, 2^{21131001013203} is an apocalyptic number.

21131001013203 is a deficient number, since it is larger than the sum of its proper divisors (9391556005881).

21131001013203 is a wasteful number, since it uses less digits than its factorization.

21131001013203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2347889001473 (or 2347889001470 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 21131001013203 its reverse (30231010013112), we get a palindrome (51362011026315).

The spelling of 21131001013203 in words is "twenty-one trillion, one hundred thirty-one billion, one million, thirteen thousand, two hundred three".