21519169028 has 24 divisors (see below), whose sum is σ = 43065614592. Its totient is φ = 9216656064.

The previous prime is 21519169027. The next prime is 21519169057. The reversal of 21519169028 is 82096191512.

It is a self number, because there is not a number n which added to its sum of digits gives 21519169028.

It is not an unprimeable number, because it can be changed into a prime (21519169027) 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, 198425 + ... + 287072.

It is an arithmetic number, because the mean of its divisors is an integer number (1794400608).

Almost surely, 2^21519169028 is an apocalyptic number.

21519169028 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21519169028 is an abundant number, since it is smaller than the sum of its proper divisors (21546445564).

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

21519169028 is a wasteful number, since it uses less digits than its factorization.

21519169028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 487091 (or 487089 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 44.

The spelling of 21519169028 in words is "twenty-one billion, five hundred nineteen million, one hundred sixty-nine thousand, twenty-eight".