21251429148 has 24 divisors (see below), whose sum is σ = 49628266128. Its totient is φ = 7077867136.

The previous prime is 21251429141. The next prime is 21251429153. The reversal of 21251429148 is 84192415212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21251429141) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 727911 + ... + 756542.

It is an arithmetic number, because the mean of its divisors is an integer number (2067844422).

Almost surely, 2^21251429148 is an apocalyptic number.

It is an amenable number.

21251429148 is an abundant number, since it is smaller than the sum of its proper divisors (28376836980).

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

21251429148 is a wasteful number, since it uses less digits than its factorization.

21251429148 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1485653 (or 1485651 counting only the distinct ones).

The product of its digits is 46080, while the sum is 39.

The spelling of 21251429148 in words is "twenty-one billion, two hundred fifty-one million, four hundred twenty-nine thousand, one hundred forty-eight".