20001213133 has 24 divisors (see below), whose sum is σ = 23424987456. Its totient is φ = 16878067200.

The previous prime is 20001213121. The next prime is 20001213143. The reversal of 20001213133 is 33131210002.

It is not a de Polignac number, because 20001213133 - 2¹³ = 20001204941 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 (20001213143) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 986488 + ... + 1006558.

It is an arithmetic number, because the mean of its divisors is an integer number (976041144).

Almost surely, 2^20001213133 is an apocalyptic number.

It is an amenable number.

20001213133 is a deficient number, since it is larger than the sum of its proper divisors (3423774323).

20001213133 is a wasteful number, since it uses less digits than its factorization.

20001213133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20245 (or 20172 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 20001213133 its reverse (33131210002), we get a palindrome (53132423135).

The spelling of 20001213133 in words is "twenty billion, one million, two hundred thirteen thousand, one hundred thirty-three".