21011122230031 has 4 divisors (see below), whose sum is σ = 21013830205600. Its totient is φ = 21008414254464.

The previous prime is 21011122230011. The next prime is 21011122230053. The reversal of 21011122230031 is 13003222111012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21011122230031 - 2⁹ = 21011122229519 is a prime.

It is a super-2 number, since 2×21011122230031² (a number of 27 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 = 21011122229990 and 21011122230008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011122230011) 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 3 ways as a sum of consecutive naturals, for example, 1353976146 + ... + 1353991663.

It is an arithmetic number, because the mean of its divisors is an integer number (5253457551400).

Almost surely, 2^{21011122230031} is an apocalyptic number.

21011122230031 is a deficient number, since it is larger than the sum of its proper divisors (2707975569).

21011122230031 is an equidigital number, since it uses as much as digits as its factorization.

21011122230031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2707975568.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 21011122230031 its reverse (13003222111012), we get a palindrome (34014344341043).

The spelling of 21011122230031 in words is "twenty-one trillion, eleven billion, one hundred twenty-two million, two hundred thirty thousand, thirty-one".