21213011331 has 6 divisors (see below), whose sum is σ = 30641016380. Its totient is φ = 14142007548.

The previous prime is 21213011329. The next prime is 21213011419. The reversal of 21213011331 is 13311031212.

It is not a de Polignac number, because 21213011331 - 2¹ = 21213011329 is a prime.

It is a super-3 number, since 3×21213011331³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21213011231) 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 5 ways as a sum of consecutive naturals, for example, 1178500621 + ... + 1178500638.

Almost surely, 2^21213011331 is an apocalyptic number.

21213011331 is a deficient number, since it is larger than the sum of its proper divisors (9428005049).

21213011331 is a wasteful number, since it uses less digits than its factorization.

21213011331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2357001265 (or 2357001262 counting only the distinct ones).

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

Adding to 21213011331 its reverse (13311031212), we get a palindrome (34524042543).

The spelling of 21213011331 in words is "twenty-one billion, two hundred thirteen million, eleven thousand, three hundred thirty-one".