21331101231 has 48 divisors (see below), whose sum is σ = 33791022720. Its totient is φ = 12859560000.

The previous prime is 21331101227. The next prime is 21331101299. The reversal of 21331101231 is 13210113312.

21331101231 is a `hidden beast` number, since 2 + 1 + 331 + 101 + 231 = 666.

It is not a de Polignac number, because 21331101231 - 2² = 21331101227 is a prime.

It is a super-3 number, since 3×21331101231³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21331101331) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 26301816 + ... + 26302626.

It is an arithmetic number, because the mean of its divisors is an integer number (703979640).

Almost surely, 2^21331101231 is an apocalyptic number.

21331101231 is a deficient number, since it is larger than the sum of its proper divisors (12459921489).

21331101231 is a wasteful number, since it uses less digits than its factorization.

21331101231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1908 (or 1905 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 21331101231 its reverse (13210113312), we get a palindrome (34541214543).

The spelling of 21331101231 in words is "twenty-one billion, three hundred thirty-one million, one hundred one thousand, two hundred thirty-one".