21423344312 has 32 divisors (see below), whose sum is σ = 40672022400. Its totient is φ = 10578284544.

The previous prime is 21423344309. The next prime is 21423344347. The reversal of 21423344312 is 21344332412.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 160889 + ... + 262167.

It is an arithmetic number, because the mean of its divisors is an integer number (1271000700).

Almost surely, 2^21423344312 is an apocalyptic number.

It is an amenable number.

21423344312 is a deficient number, since it is larger than the sum of its proper divisors (19248678088).

21423344312 is a wasteful number, since it uses less digits than its factorization.

21423344312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101615 (or 101611 counting only the distinct ones).

The product of its digits is 13824, while the sum is 29.

Adding to 21423344312 its reverse (21344332412), we get a palindrome (42767676724).

The spelling of 21423344312 in words is "twenty-one billion, four hundred twenty-three million, three hundred forty-four thousand, three hundred twelve".