21270125028 has 48 divisors (see below), whose sum is σ = 50986454400. Its totient is φ = 6896415744.

The previous prime is 21270125027. The next prime is 21270125039. The reversal of 21270125028 is 82052107212.

It is a junction number, because it is equal to n+sod(n) for n = 21270124986 and 21270125004.

It is not an unprimeable number, because it can be changed into a prime (21270125027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2776948 + ... + 2784596.

It is an arithmetic number, because the mean of its divisors is an integer number (1062217800).

Almost surely, 2^21270125028 is an apocalyptic number.

It is an amenable number.

21270125028 is an abundant number, since it is smaller than the sum of its proper divisors (29716329372).

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

21270125028 is a wasteful number, since it uses less digits than its factorization.

21270125028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13956 (or 13954 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 30.

The spelling of 21270125028 in words is "twenty-one billion, two hundred seventy million, one hundred twenty-five thousand, twenty-eight".