21210010197 has 8 divisors (see below), whose sum is σ = 28285320000. Its totient is φ = 14137353600.

The previous prime is 21210010189. The next prime is 21210010207. The reversal of 21210010197 is 79101001212.

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

It is not a de Polignac number, because 21210010197 - 2³ = 21210010189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210010177) 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, 644572 + ... + 676677.

It is an arithmetic number, because the mean of its divisors is an integer number (3535665000).

Almost surely, 2^21210010197 is an apocalyptic number.

It is an amenable number.

21210010197 is a deficient number, since it is larger than the sum of its proper divisors (7075309803).

21210010197 is a wasteful number, since it uses less digits than its factorization.

21210010197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1326603.

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

The spelling of 21210010197 in words is "twenty-one billion, two hundred ten million, ten thousand, one hundred ninety-seven".