21211122031 has 12 divisors (see below), whose sum is σ = 24189215400. Its totient is φ = 18444448880.

The previous prime is 21211122011. The next prime is 21211122059. The reversal of 21211122031 is 13022111212.

It is not a de Polignac number, because 21211122031 - 2²³ = 21202733423 is a prime.

It is a super-2 number, since 2×21211122031² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21211121996 and 21211122014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211122011) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1816756 + ... + 1828393.

It is an arithmetic number, because the mean of its divisors is an integer number (2015767950).

Almost surely, 2^21211122031 is an apocalyptic number.

21211122031 is a deficient number, since it is larger than the sum of its proper divisors (2978093369).

21211122031 is a wasteful number, since it uses less digits than its factorization.

21211122031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3645206 (or 3645183 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 21211122031 its reverse (13022111212), we get a palindrome (34233233243).

The spelling of 21211122031 in words is "twenty-one billion, two hundred eleven million, one hundred twenty-two thousand, thirty-one".