20021123331 has 24 divisors (see below), whose sum is σ = 31584546864. Its totient is φ = 12120125760.

The previous prime is 20021123293. The next prime is 20021123413. The reversal of 20021123331 is 13332112002.

It is not a de Polignac number, because 20021123331 - 2⁶ = 20021123267 is a prime.

It is a super-2 number, since 2×20021123331² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20021123531) 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, 28476 + ... + 202121.

It is an arithmetic number, because the mean of its divisors is an integer number (1316022786).

Almost surely, 2^20021123331 is an apocalyptic number.

20021123331 is a deficient number, since it is larger than the sum of its proper divisors (11563423533).

20021123331 is a wasteful number, since it uses less digits than its factorization.

20021123331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231491 (or 231488 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 20021123331 its reverse (13332112002), we get a palindrome (33353235333).

The spelling of 20021123331 in words is "twenty billion, twenty-one million, one hundred twenty-three thousand, three hundred thirty-one".