21142344124 has 48 divisors (see below), whose sum is σ = 40718990592. Its totient is φ = 9525600000.

The previous prime is 21142344101. The next prime is 21142344127. The reversal of 21142344124 is 42144324112.

It is a junction number, because it is equal to n+sod(n) for n = 21142344092 and 21142344101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21142344127) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3258964 + ... + 3265444.

It is an arithmetic number, because the mean of its divisors is an integer number (848312304).

Almost surely, 2^21142344124 is an apocalyptic number.

It is an amenable number.

21142344124 is a deficient number, since it is larger than the sum of its proper divisors (19576646468).

21142344124 is a wasteful number, since it uses less digits than its factorization.

21142344124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7138 (or 7136 counting only the distinct ones).

The product of its digits is 6144, while the sum is 28.

Adding to 21142344124 its reverse (42144324112), we get a palindrome (63286668236).

The spelling of 21142344124 in words is "twenty-one billion, one hundred forty-two million, three hundred forty-four thousand, one hundred twenty-four".