21100243211031 has 16 divisors (see below), whose sum is σ = 28204978053888. Its totient is φ = 14031196358400.

The previous prime is 21100243210979. The next prime is 21100243211101. The reversal of 21100243211031 is 13011234200112.

It is not a de Polignac number, because 21100243211031 - 2¹³ = 21100243202839 is a prime.

It is a super-2 number, since 2×21100243211031² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21100243210989 and 21100243211007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21100243211231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 429705 + ... + 6510386.

It is an arithmetic number, because the mean of its divisors is an integer number (1762811128368).

Almost surely, 2^{21100243211031} is an apocalyptic number.

21100243211031 is a deficient number, since it is larger than the sum of its proper divisors (7104734842857).

21100243211031 is a wasteful number, since it uses less digits than its factorization.

21100243211031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6942662.

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 21100243211031 its reverse (13011234200112), we get a palindrome (34111477411143).

The spelling of 21100243211031 in words is "twenty-one trillion, one hundred billion, two hundred forty-three million, two hundred eleven thousand, thirty-one".