21343322121 has 64 divisors (see below), whose sum is σ = 32841897984. Its totient is φ = 12203136000.

The previous prime is 21343322107. The next prime is 21343322137. The reversal of 21343322121 is 12122334312.

It is not a de Polignac number, because 21343322121 - 2⁵ = 21343322089 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21343322091 and 21343322100.

It is not an unprimeable number, because it can be changed into a prime (21343322101) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 33193026 + ... + 33193668.

It is an arithmetic number, because the mean of its divisors is an integer number (513154656).

Almost surely, 2^21343322121 is an apocalyptic number.

It is an amenable number.

21343322121 is a deficient number, since it is larger than the sum of its proper divisors (11498575863).

21343322121 is a wasteful number, since it uses less digits than its factorization.

21343322121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1214.

The product of its digits is 1728, while the sum is 24.

Adding to 21343322121 its reverse (12122334312), we get a palindrome (33465656433).

It can be divided in two parts, 213 and 43322121, that added together give a palindrome (43322334).

The spelling of 21343322121 in words is "twenty-one billion, three hundred forty-three million, three hundred twenty-two thousand, one hundred twenty-one".