21010331331 has 24 divisors (see below), whose sum is σ = 35054673264. Its totient is φ = 11984501760.

The previous prime is 21010331273. The next prime is 21010331411. The reversal of 21010331331 is 13313301012.

It is a happy number.

21010331331 is a `hidden beast` number, since 2 + 1 + 0 + 1 + 0 + 331 + 331 = 666.

It is not a de Polignac number, because 21010331331 - 2¹⁰ = 21010330307 is a prime.

It is a super-2 number, since 2×21010331331² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21010331731) 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, 6240246 + ... + 6243611.

It is an arithmetic number, because the mean of its divisors is an integer number (1460611386).

Almost surely, 2^21010331331 is an apocalyptic number.

21010331331 is a deficient number, since it is larger than the sum of its proper divisors (14044341933).

21010331331 is a wasteful number, since it uses less digits than its factorization.

21010331331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12483891 (or 12483888 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 18.

Adding to 21010331331 its reverse (13313301012), we get a palindrome (34323632343).

The spelling of 21010331331 in words is "twenty-one billion, ten million, three hundred thirty-one thousand, three hundred thirty-one".