19821062554 has 16 divisors (see below), whose sum is σ = 30237217920. Its totient is φ = 9743067360.

The previous prime is 19821062543. The next prime is 19821062557. The reversal of 19821062554 is 45526012891.

It is a self number, because there is not a number n which added to its sum of digits gives 19821062554.

It is not an unprimeable number, because it can be changed into a prime (19821062557) 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, 232392 + ... + 306019.

It is an arithmetic number, because the mean of its divisors is an integer number (1889826120).

Almost surely, 2^19821062554 is an apocalyptic number.

19821062554 is a deficient number, since it is larger than the sum of its proper divisors (10416155366).

19821062554 is a wasteful number, since it uses less digits than its factorization.

19821062554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 538725.

The product of its (nonzero) digits is 172800, while the sum is 43.

The spelling of 19821062554 in words is "nineteen billion, eight hundred twenty-one million, sixty-two thousand, five hundred fifty-four".