21344340412 has 48 divisors (see below), whose sum is σ = 40356973440. Its totient is φ = 9839977472.

The previous prime is 21344340401. The next prime is 21344340427. The reversal of 21344340412 is 21404344312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2587158 + ... + 2595394.

It is an arithmetic number, because the mean of its divisors is an integer number (840770280).

Almost surely, 2^21344340412 is an apocalyptic number.

It is an amenable number.

21344340412 is a deficient number, since it is larger than the sum of its proper divisors (19012633028).

21344340412 is a wasteful number, since it uses less digits than its factorization.

21344340412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9030 (or 9028 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 28.

Adding to 21344340412 its reverse (21404344312), we get a palindrome (42748684724).

The spelling of 21344340412 in words is "twenty-one billion, three hundred forty-four million, three hundred forty thousand, four hundred twelve".