19621084028 has 24 divisors (see below), whose sum is σ = 42260797152. Its totient is φ = 7762186944.

The previous prime is 19621083973. The next prime is 19621084037. The reversal of 19621084028 is 82048012691.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26951675 + ... + 26952402.

It is an arithmetic number, because the mean of its divisors is an integer number (1760866548).

Almost surely, 2^19621084028 is an apocalyptic number.

It is an amenable number.

19621084028 is an abundant number, since it is smaller than the sum of its proper divisors (22639713124).

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

19621084028 is a wasteful number, since it uses less digits than its factorization.

19621084028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53904101 (or 53904099 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 41.

The spelling of 19621084028 in words is "nineteen billion, six hundred twenty-one million, eighty-four thousand, twenty-eight".