19421897472 has 108 divisors (see below), whose sum is σ = 58072308840. Its totient is φ = 6473945088.

The previous prime is 19421897471. The next prime is 19421897483. The reversal of 19421897472 is 27479812491.

19421897472 is a `hidden beast` number, since 1 + 9 + 421 + 89 + 74 + 72 = 666.

It is a tau number, because it is divible by the number of its divisors (108).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (19421897471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 93897 + ... + 218312.

Almost surely, 2^19421897472 is an apocalyptic number.

19421897472 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

19421897472 is an abundant number, since it is smaller than the sum of its proper divisors (38650411368).

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

19421897472 is an frugal number, since it uses more digits than its factorization.

19421897472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312240 (or 312214 counting only the distinct ones).

The product of its digits is 2032128, while the sum is 54.

The spelling of 19421897472 in words is "nineteen billion, four hundred twenty-one million, eight hundred ninety-seven thousand, four hundred seventy-two".