21031122203 has 8 divisors (see below), whose sum is σ = 25884458208. Its totient is φ = 16640008704.

The previous prime is 21031122199. The next prime is 21031122209. The reversal of 21031122203 is 30222113012.

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 21031122203 - 2² = 21031122199 is a prime.

It is a super-2 number, since 2×21031122203² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21031122209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 115555526 + ... + 115555707.

It is an arithmetic number, because the mean of its divisors is an integer number (3235557276).

Almost surely, 2^21031122203 is an apocalyptic number.

21031122203 is a deficient number, since it is larger than the sum of its proper divisors (4853336005).

21031122203 is a wasteful number, since it uses less digits than its factorization.

21031122203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231111253.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21031122203 its reverse (30222113012), we get a palindrome (51253235215).

The spelling of 21031122203 in words is "twenty-one billion, thirty-one million, one hundred twenty-two thousand, two hundred three".