21125416233 has 16 divisors (see below), whose sum is σ = 28375704000. Its totient is φ = 13979499840.

The previous prime is 21125416229. The next prime is 21125416261. The reversal of 21125416233 is 33261452112.

It is not a de Polignac number, because 21125416233 - 2² = 21125416229 is a prime.

It is a super-3 number, since 3×21125416233³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 21125416233.

It is not an unprimeable number, because it can be changed into a prime (21125416223) 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, 668923 + ... + 699791.

It is an arithmetic number, because the mean of its divisors is an integer number (1773481500).

Almost surely, 2^21125416233 is an apocalyptic number.

It is an amenable number.

21125416233 is a deficient number, since it is larger than the sum of its proper divisors (7250287767).

21125416233 is a wasteful number, since it uses less digits than its factorization.

21125416233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32552.

The product of its digits is 8640, while the sum is 30.

Adding to 21125416233 its reverse (33261452112), we get a palindrome (54386868345).

The spelling of 21125416233 in words is "twenty-one billion, one hundred twenty-five million, four hundred sixteen thousand, two hundred thirty-three".