19721123610 has 32 divisors (see below), whose sum is σ = 47433399552. Its totient is φ = 5247554880.

The previous prime is 19721123599. The next prime is 19721123621. The reversal of 19721123610 is 1632112791.

19721123610 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (19721123599) and next prime (19721123621).

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 699154 + ... + 726813.

It is an arithmetic number, because the mean of its divisors is an integer number (1482293736).

Almost surely, 2^19721123610 is an apocalyptic number.

19721123610 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19721123610 is an abundant number, since it is smaller than the sum of its proper divisors (27712275942).

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

19721123610 is a wasteful number, since it uses less digits than its factorization.

19721123610 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1426438.

The product of its (nonzero) digits is 4536, while the sum is 33.

The spelling of 19721123610 in words is "nineteen billion, seven hundred twenty-one million, one hundred twenty-three thousand, six hundred ten".