21100211031 has 8 divisors (see below), whose sum is σ = 28134730624. Its totient is φ = 14066249400.

The previous prime is 21100211029. The next prime is 21100211071. The reversal of 21100211031 is 13011200112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21100211031 - 2¹ = 21100211029 is a prime.

It is a super-2 number, since 2×21100211031² (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 = 21100210998 and 21100211016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21100211071) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41395 + ... + 209556.

It is an arithmetic number, because the mean of its divisors is an integer number (3516841328).

Almost surely, 2^21100211031 is an apocalyptic number.

21100211031 is a deficient number, since it is larger than the sum of its proper divisors (7034519593).

21100211031 is a wasteful number, since it uses less digits than its factorization.

21100211031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278981.

The product of its (nonzero) digits is 12, while the sum is 12.

Adding to 21100211031 its reverse (13011200112), we get a palindrome (34111411143).

The spelling of 21100211031 in words is "twenty-one billion, one hundred million, two hundred eleven thousand, thirty-one".