20133213123 has 4 divisors (see below), whose sum is σ = 26844284168. Its totient is φ = 13422142080.

The previous prime is 20133213103. The next prime is 20133213127. The reversal of 20133213123 is 32131233102.

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

It is not a de Polignac number, because 20133213123 - 2³² = 15838245827 is a prime.

It is a super-2 number, since 2×20133213123² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20133213123.

It is not an unprimeable number, because it can be changed into a prime (20133213127) 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, 3355535518 + ... + 3355535523.

It is an arithmetic number, because the mean of its divisors is an integer number (6711071042).

Almost surely, 2^20133213123 is an apocalyptic number.

20133213123 is a deficient number, since it is larger than the sum of its proper divisors (6711071045).

20133213123 is an equidigital number, since it uses as much as digits as its factorization.

20133213123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6711071044.

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 20133213123 its reverse (32131233102), we get a palindrome (52264446225).

The spelling of 20133213123 in words is "twenty billion, one hundred thirty-three million, two hundred thirteen thousand, one hundred twenty-three".