21045450124 has 24 divisors (see below), whose sum is σ = 37115442000. Its totient is φ = 10441124160.

The previous prime is 21045450089. The next prime is 21045450131. The reversal of 21045450124 is 42105454012.

It is a junction number, because it is equal to n+sod(n) for n = 21045450092 and 21045450101.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1073934 + ... + 1093354.

It is an arithmetic number, because the mean of its divisors is an integer number (1546476750).

Almost surely, 2^21045450124 is an apocalyptic number.

It is an amenable number.

21045450124 is a deficient number, since it is larger than the sum of its proper divisors (16069991876).

21045450124 is a wasteful number, since it uses less digits than its factorization.

21045450124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21513 (or 21511 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 28.

The spelling of 21045450124 in words is "twenty-one billion, forty-five million, four hundred fifty thousand, one hundred twenty-four".