21152049828 has 96 divisors (see below), whose sum is σ = 62703943680. Its totient is φ = 5398600320.

The previous prime is 21152049823. The next prime is 21152049847. The reversal of 21152049828 is 82894025112.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a self number, because there is not a number n which added to its sum of digits gives 21152049828.

It is not an unprimeable number, because it can be changed into a prime (21152049823) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 278568 + ... + 346271.

It is an arithmetic number, because the mean of its divisors is an integer number (653166080).

Almost surely, 2^21152049828 is an apocalyptic number.

21152049828 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21152049828 is an abundant number, since it is smaller than the sum of its proper divisors (41551893852).

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

21152049828 is a wasteful number, since it uses less digits than its factorization.

21152049828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 624897 (or 624895 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 42.

The spelling of 21152049828 in words is "twenty-one billion, one hundred fifty-two million, forty-nine thousand, eight hundred twenty-eight".