21401376528 has 40 divisors (see below), whose sum is σ = 63185017408. Its totient is φ = 6114678912.

The previous prime is 21401376527. The next prime is 21401376553. The reversal of 21401376528 is 82567310412.

It is not an unprimeable number, because it can be changed into a prime (21401376527) 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 7 ways as a sum of consecutive naturals, for example, 31846951 + ... + 31847622.

Almost surely, 2^21401376528 is an apocalyptic number.

21401376528 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21401376528 is an abundant number, since it is smaller than the sum of its proper divisors (41783640880).

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

21401376528 is a wasteful number, since it uses less digits than its factorization.

21401376528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63694591 (or 63694585 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 39.

The spelling of 21401376528 in words is "twenty-one billion, four hundred one million, three hundred seventy-six thousand, five hundred twenty-eight".