21342023124 has 24 divisors (see below), whose sum is σ = 50281533120. Its totient is φ = 7044939264.

The previous prime is 21342023123. The next prime is 21342023137. The reversal of 21342023124 is 42132024312.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21342023094 and 21342023103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21342023123) 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, 8632269 + ... + 8634740.

It is an arithmetic number, because the mean of its divisors is an integer number (2095063880).

Almost surely, 2^21342023124 is an apocalyptic number.

It is an amenable number.

21342023124 is an abundant number, since it is smaller than the sum of its proper divisors (28939509996).

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

21342023124 is a wasteful number, since it uses less digits than its factorization.

21342023124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17267119 (or 17267117 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 21342023124 its reverse (42132024312), we get a palindrome (63474047436).

The spelling of 21342023124 in words is "twenty-one billion, three hundred forty-two million, twenty-three thousand, one hundred twenty-four".