21020102133 has 4 divisors (see below), whose sum is σ = 28026802848. Its totient is φ = 14013401420.

The previous prime is 21020102119. The next prime is 21020102143. The reversal of 21020102133 is 33120102012.

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 21020102133 - 2⁵ = 21020102101 is a prime.

It is a super-2 number, since 2×21020102133² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21020102113) 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, 3503350353 + ... + 3503350358.

It is an arithmetic number, because the mean of its divisors is an integer number (7006700712).

Almost surely, 2^21020102133 is an apocalyptic number.

It is an amenable number.

21020102133 is a deficient number, since it is larger than the sum of its proper divisors (7006700715).

21020102133 is an equidigital number, since it uses as much as digits as its factorization.

21020102133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7006700714.

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

Adding to 21020102133 its reverse (33120102012), we get a palindrome (54140204145).

The spelling of 21020102133 in words is "twenty-one billion, twenty million, one hundred two thousand, one hundred thirty-three".