19723024981 has 32 divisors (see below), whose sum is σ = 22240189440. Its totient is φ = 17338473600.

The previous prime is 19723024933. The next prime is 19723025017. The reversal of 19723024981 is 18942032791.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 19723024981 - 2²¹ = 19720927829 is a prime.

It is a super-2 number, since 2×19723024981² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19723024901) 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 31 ways as a sum of consecutive naturals, for example, 15135976 + ... + 15137278.

It is an arithmetic number, because the mean of its divisors is an integer number (695005920).

Almost surely, 2^19723024981 is an apocalyptic number.

19723024981 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

19723024981 is a deficient number, since it is larger than the sum of its proper divisors (2517164459).

19723024981 is a wasteful number, since it uses less digits than its factorization.

19723024981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1737.

The product of its (nonzero) digits is 217728, while the sum is 46.

The spelling of 19723024981 in words is "nineteen billion, seven hundred twenty-three million, twenty-four thousand, nine hundred eighty-one".