21421126124 has 6 divisors (see below), whose sum is σ = 37486970724. Its totient is φ = 10710563060.

The previous prime is 21421126099. The next prime is 21421126147. The reversal of 21421126124 is 42162112412.

It is a junction number, because it is equal to n+sod(n) for n = 21421126093 and 21421126102.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2677640762 + ... + 2677640769.

It is an arithmetic number, because the mean of its divisors is an integer number (6247828454).

Almost surely, 2^21421126124 is an apocalyptic number.

It is an amenable number.

21421126124 is a deficient number, since it is larger than the sum of its proper divisors (16065844600).

21421126124 is a wasteful number, since it uses less digits than its factorization.

21421126124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5355281535 (or 5355281533 counting only the distinct ones).

The product of its digits is 1536, while the sum is 26.

Adding to 21421126124 its reverse (42162112412), we get a palindrome (63583238536).

The spelling of 21421126124 in words is "twenty-one billion, four hundred twenty-one million, one hundred twenty-six thousand, one hundred twenty-four".