19677422921 has 16 divisors (see below), whose sum is σ = 22118334336. Its totient is φ = 17369400576.

The previous prime is 19677422881. The next prime is 19677422927. The reversal of 19677422921 is 12922477691.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 19677422921 - 2¹⁴ = 19677406537 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 19677422921.

It is not an unprimeable number, because it can be changed into a prime (19677422927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1606406 + ... + 1618608.

It is an arithmetic number, because the mean of its divisors is an integer number (1382395896).

Almost surely, 2^19677422921 is an apocalyptic number.

It is an amenable number.

19677422921 is a deficient number, since it is larger than the sum of its proper divisors (2440911415).

19677422921 is a wasteful number, since it uses less digits than its factorization.

19677422921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17632.

The product of its digits is 762048, while the sum is 50.

The spelling of 19677422921 in words is "nineteen billion, six hundred seventy-seven million, four hundred twenty-two thousand, nine hundred twenty-one".