21211120031 has 24 divisors (see below), whose sum is σ = 23473784880. Its totient is φ = 19145753600.

The previous prime is 21211120013. The next prime is 21211120039. The reversal of 21211120031 is 13002111212.

It is not a de Polignac number, because 21211120031 - 2³⁰ = 20137378207 is a prime.

It is a super-2 number, since 2×21211120031² (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 = 21211119988 and 21211120015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211120039) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 683921 + ... + 714261.

It is an arithmetic number, because the mean of its divisors is an integer number (978074370).

Almost surely, 2^21211120031 is an apocalyptic number.

21211120031 is a deficient number, since it is larger than the sum of its proper divisors (2262664849).

21211120031 is a wasteful number, since it uses less digits than its factorization.

21211120031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30475 (or 30458 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 21211120031 its reverse (13002111212), we get a palindrome (34213231243).

The spelling of 21211120031 in words is "twenty-one billion, two hundred eleven million, one hundred twenty thousand, thirty-one".