21471120197 has 8 divisors (see below), whose sum is σ = 21914430720. Its totient is φ = 21030755760.

The previous prime is 21471120191. The next prime is 21471120257. The reversal of 21471120197 is 79102117412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21471120197 - 2³⁰ = 20397378373 is a prime.

It is a super-2 number, since 2×21471120197² (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 (21471120191) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 721793 + ... + 750950.

It is an arithmetic number, because the mean of its divisors is an integer number (2739303840).

Almost surely, 2^21471120197 is an apocalyptic number.

It is an amenable number.

21471120197 is a deficient number, since it is larger than the sum of its proper divisors (443310523).

21471120197 is a wasteful number, since it uses less digits than its factorization.

21471120197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1473043.

The product of its (nonzero) digits is 7056, while the sum is 35.

The spelling of 21471120197 in words is "twenty-one billion, four hundred seventy-one million, one hundred twenty thousand, one hundred ninety-seven".