21213020133 has 12 divisors (see below), whose sum is σ = 30688396128. Its totient is φ = 14120151720.

The previous prime is 21213020123. The next prime is 21213020161. The reversal of 21213020133 is 33102031212.

It is not a de Polignac number, because 21213020133 - 2⁶ = 21213020069 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21213020123) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1815663 + ... + 1827308.

It is an arithmetic number, because the mean of its divisors is an integer number (2557366344).

Almost surely, 2^21213020133 is an apocalyptic number.

It is an amenable number.

21213020133 is a deficient number, since it is larger than the sum of its proper divisors (9475375995).

21213020133 is a wasteful number, since it uses less digits than its factorization.

21213020133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3643624 (or 3643621 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 21213020133 its reverse (33102031212), we get a palindrome (54315051345).

The spelling of 21213020133 in words is "twenty-one billion, two hundred thirteen million, twenty thousand, one hundred thirty-three".