21124244020 has 48 divisors (see below), whose sum is σ = 48637008000. Its totient is φ = 7642926720.

The previous prime is 21124243999. The next prime is 21124244041. The reversal of 21124244020 is 2044242112.

It is an interprime number because it is at equal distance from previous prime (21124243999) and next prime (21124244041).

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 21124243982 and 21124244000.

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, 197475 + ... + 285034.

It is an arithmetic number, because the mean of its divisors is an integer number (1013271000).

Almost surely, 2^21124244020 is an apocalyptic number.

21124244020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21124244020 is an abundant number, since it is smaller than the sum of its proper divisors (27512763980).

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

21124244020 is a wasteful number, since it uses less digits than its factorization.

21124244020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 482728 (or 482726 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 22.

Adding to 21124244020 its reverse (2044242112), we get a palindrome (23168486132).

The spelling of 21124244020 in words is "twenty-one billion, one hundred twenty-four million, two hundred forty-four thousand, twenty".