21044022828 has 24 divisors (see below), whose sum is σ = 49106969520. Its totient is φ = 7014067200.

The previous prime is 21044022823. The next prime is 21044022829. The reversal of 21044022828 is 82822044012.

It is not an unprimeable number, because it can be changed into a prime (21044022821) 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, 81628 + ... + 220796.

It is an arithmetic number, because the mean of its divisors is an integer number (2046123730).

Almost surely, 2^21044022828 is an apocalyptic number.

It is an amenable number.

21044022828 is an abundant number, since it is smaller than the sum of its proper divisors (28062946692).

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

21044022828 is a wasteful number, since it uses less digits than its factorization.

21044022828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151777 (or 151775 counting only the distinct ones).

The product of its (nonzero) digits is 16384, while the sum is 33.

The spelling of 21044022828 in words is "twenty-one billion, forty-four million, twenty-two thousand, eight hundred twenty-eight".