21133311331 has 16 divisors (see below), whose sum is σ = 23181545088. Its totient is φ = 19106452800.

The previous prime is 21133311323. The next prime is 21133311343. The reversal of 21133311331 is 13311333112.

It is a cyclic number.

It is not a de Polignac number, because 21133311331 - 2³ = 21133311323 is a prime.

It is a super-2 number, since 2×21133311331² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21133311361) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2320096 + ... + 2329186.

It is an arithmetic number, because the mean of its divisors is an integer number (1448846568).

Almost surely, 2^21133311331 is an apocalyptic number.

21133311331 is a deficient number, since it is larger than the sum of its proper divisors (2048233757).

21133311331 is a wasteful number, since it uses less digits than its factorization.

21133311331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10242.

The product of its digits is 486, while the sum is 22.

Adding to 21133311331 its reverse (13311333112), we get a palindrome (34444644443).

The spelling of 21133311331 in words is "twenty-one billion, one hundred thirty-three million, three hundred eleven thousand, three hundred thirty-one".