21201010197 has 8 divisors (see below), whose sum is σ = 28269640320. Its totient is φ = 14133193440.

The previous prime is 21201010189. The next prime is 21201010213. The reversal of 21201010197 is 79101010212.

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

It is not a de Polignac number, because 21201010197 - 2³ = 21201010189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21200010197) 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, 139672 + ... + 248817.

It is an arithmetic number, because the mean of its divisors is an integer number (3533705040).

Almost surely, 2^21201010197 is an apocalyptic number.

It is an amenable number.

21201010197 is a deficient number, since it is larger than the sum of its proper divisors (7068630123).

21201010197 is a wasteful number, since it uses less digits than its factorization.

21201010197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406683.

The product of its (nonzero) digits is 252, while the sum is 24.

The spelling of 21201010197 in words is "twenty-one billion, two hundred one million, ten thousand, one hundred ninety-seven".