21441220124 has 12 divisors (see below), whose sum is σ = 37557912000. Its totient is φ = 10710388128.

The previous prime is 21441220061. The next prime is 21441220133. The reversal of 21441220124 is 42102214412.

It is a self number, because there is not a number n which added to its sum of digits gives 21441220124.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2550764 + ... + 2559155.

It is an arithmetic number, because the mean of its divisors is an integer number (3129826000).

Almost surely, 2^21441220124 is an apocalyptic number.

It is an amenable number.

21441220124 is a deficient number, since it is larger than the sum of its proper divisors (16116691876).

21441220124 is a wasteful number, since it uses less digits than its factorization.

21441220124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5110972 (or 5110970 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 23.

Adding to 21441220124 its reverse (42102214412), we get a palindrome (63543434536).

The spelling of 21441220124 in words is "twenty-one billion, four hundred forty-one million, two hundred twenty thousand, one hundred twenty-four".