21213312133 has 12 divisors (see below), whose sum is σ = 23313485568. Its totient is φ = 19289247120.

The previous prime is 21213312119. The next prime is 21213312151. The reversal of 21213312133 is 33121331212.

It is not a de Polignac number, because 21213312133 - 2⁵ = 21213312101 is a prime.

It is a super-2 number, since 2×21213312133² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21213312193) 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, 925413 + ... + 948058.

It is an arithmetic number, because the mean of its divisors is an integer number (1942790464).

Almost surely, 2^21213312133 is an apocalyptic number.

It is an amenable number.

21213312133 is a deficient number, since it is larger than the sum of its proper divisors (2100173435).

21213312133 is a wasteful number, since it uses less digits than its factorization.

21213312133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1873564 (or 1873551 counting only the distinct ones).

The product of its digits is 648, while the sum is 22.

Adding to 21213312133 its reverse (33121331212), we get a palindrome (54334643345).

The spelling of 21213312133 in words is "twenty-one billion, two hundred thirteen million, three hundred twelve thousand, one hundred thirty-three".