21311212334 has 8 divisors (see below), whose sum is σ = 31992790368. Its totient is φ = 10646948880.

The previous prime is 21311212333. The next prime is 21311212337. The reversal of 21311212334 is 43321211312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21311212334² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21311212333) 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, 4325567 + ... + 4330490.

It is an arithmetic number, because the mean of its divisors is an integer number (3999098796).

Almost surely, 2^21311212334 is an apocalyptic number.

21311212334 is a deficient number, since it is larger than the sum of its proper divisors (10681578034).

21311212334 is a wasteful number, since it uses less digits than its factorization.

21311212334 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8657290.

The product of its digits is 864, while the sum is 23.

Adding to 21311212334 its reverse (43321211312), we get a palindrome (64632423646).

The spelling of 21311212334 in words is "twenty-one billion, three hundred eleven million, two hundred twelve thousand, three hundred thirty-four".