21012332133 has 16 divisors (see below), whose sum is σ = 31211953920. Its totient is φ = 12484780224.

The previous prime is 21012332071. The next prime is 21012332147. The reversal of 21012332133 is 33123321012.

It is not a de Polignac number, because 21012332133 - 2¹² = 21012328037 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012332833) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9288141 + ... + 9290402.

It is an arithmetic number, because the mean of its divisors is an integer number (1950747120).

Almost surely, 2^21012332133 is an apocalyptic number.

It is an amenable number.

21012332133 is a deficient number, since it is larger than the sum of its proper divisors (10199621787).

21012332133 is a wasteful number, since it uses less digits than its factorization.

21012332133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18578588.

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

Adding to 21012332133 its reverse (33123321012), we get a palindrome (54135653145).

The spelling of 21012332133 in words is "twenty-one billion, twelve million, three hundred thirty-two thousand, one hundred thirty-three".