21343124012 has 24 divisors (see below), whose sum is σ = 42698447904. Its totient is φ = 9144438912.

The previous prime is 21343123961. The next prime is 21343124017. The reversal of 21343124012 is 21042134312.

It is a super-2 number, since 2×21343124012² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21343124017) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7553 + ... + 206744.

It is an arithmetic number, because the mean of its divisors is an integer number (1779101996).

Almost surely, 2^21343124012 is an apocalyptic number.

It is an amenable number.

21343124012 is an abundant number, since it is smaller than the sum of its proper divisors (21355323892).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21343124012 is a wasteful number, since it uses less digits than its factorization.

21343124012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217865 (or 217863 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 21343124012 its reverse (21042134312), we get a palindrome (42385258324).

The spelling of 21343124012 in words is "twenty-one billion, three hundred forty-three million, one hundred twenty-four thousand, twelve".