16121223533 has 8 divisors (see below), whose sum is σ = 16463175456. Its totient is φ = 15781777200.

The previous prime is 16121223487. The next prime is 16121223553. The reversal of 16121223533 is 33532212161.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16121223533 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16121223496 and 16121223505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16121223553) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 613391 + ... + 639132.

It is an arithmetic number, because the mean of its divisors is an integer number (2057896932).

Almost surely, 2^16121223533 is an apocalyptic number.

It is an amenable number.

16121223533 is a deficient number, since it is larger than the sum of its proper divisors (341951923).

16121223533 is a wasteful number, since it uses less digits than its factorization.

16121223533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1252795.

The product of its digits is 6480, while the sum is 29.

Adding to 16121223533 its reverse (33532212161), we get a palindrome (49653435694).

The spelling of 16121223533 in words is "sixteen billion, one hundred twenty-one million, two hundred twenty-three thousand, five hundred thirty-three".