16021212533 has 4 divisors (see below), whose sum is σ = 16028958060. Its totient is φ = 16013467008.

The previous prime is 16021212523. The next prime is 16021212563. The reversal of 16021212533 is 33521212061.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2781718564 + 13239493969 = 52742^2 + 115063^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16021212533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16021212523) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3869660 + ... + 3873797.

It is an arithmetic number, because the mean of its divisors is an integer number (4007239515).

Almost surely, 2^16021212533 is an apocalyptic number.

It is an amenable number.

16021212533 is a deficient number, since it is larger than the sum of its proper divisors (7745527).

16021212533 is an equidigital number, since it uses as much as digits as its factorization.

16021212533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7745526.

The product of its (nonzero) digits is 2160, while the sum is 26.

Adding to 16021212533 its reverse (33521212061), we get a palindrome (49542424594).

The spelling of 16021212533 in words is "sixteen billion, twenty-one million, two hundred twelve thousand, five hundred thirty-three".