21012002133 has 4 divisors (see below), whose sum is σ = 28016002848. Its totient is φ = 14008001420.

The previous prime is 21012002117. The next prime is 21012002147. The reversal of 21012002133 is 33120021012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21012002133 - 2⁴ = 21012002117 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012002633) 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, 3502000353 + ... + 3502000358.

It is an arithmetic number, because the mean of its divisors is an integer number (7004000712).

Almost surely, 2^21012002133 is an apocalyptic number.

It is an amenable number.

21012002133 is a deficient number, since it is larger than the sum of its proper divisors (7004000715).

21012002133 is an equidigital number, since it uses as much as digits as its factorization.

21012002133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7004000714.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 21012002133 its reverse (33120021012), we get a palindrome (54132023145).

The spelling of 21012002133 in words is "twenty-one billion, twelve million, two thousand, one hundred thirty-three".