21233201031 has 32 divisors (see below), whose sum is σ = 36171000320. Its totient is φ = 12058803072.

The previous prime is 21233201027. The next prime is 21233201047. The reversal of 21233201031 is 13010233212.

It is not a de Polignac number, because 21233201031 - 2² = 21233201027 is a prime.

It is a super-2 number, since 2×21233201031² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21233200995 and 21233201013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21233201071) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 313810 + ... + 375423.

It is an arithmetic number, because the mean of its divisors is an integer number (1130343760).

Almost surely, 2^21233201031 is an apocalyptic number.

21233201031 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21233201031 is a deficient number, since it is larger than the sum of its proper divisors (14937799289).

21233201031 is a wasteful number, since it uses less digits than its factorization.

21233201031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 689412 (or 689406 counting only the distinct ones).

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

Adding to 21233201031 its reverse (13010233212), we get a palindrome (34243434243).

The spelling of 21233201031 in words is "twenty-one billion, two hundred thirty-three million, two hundred one thousand, thirty-one".