21033320031 has 16 divisors (see below), whose sum is σ = 31227793920. Its totient is φ = 13991919480.

The previous prime is 21033319981. The next prime is 21033320059. The reversal of 21033320031 is 13002333012.

It is not a de Polignac number, because 21033320031 - 2¹⁸ = 21033057887 is a prime.

It is a super-2 number, since 2×21033320031² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21033319986 and 21033320013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21033320081) 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, 828765 + ... + 853766.

It is an arithmetic number, because the mean of its divisors is an integer number (1951737120).

Almost surely, 2^21033320031 is an apocalyptic number.

21033320031 is a deficient number, since it is larger than the sum of its proper divisors (10194473889).

21033320031 is a wasteful number, since it uses less digits than its factorization.

21033320031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1683003 (or 1682997 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 18.

Adding to 21033320031 its reverse (13002333012), we get a palindrome (34035653043).

The spelling of 21033320031 in words is "twenty-one billion, thirty-three million, three hundred twenty thousand, thirty-one".