21100000197 has 16 divisors (see below), whose sum is σ = 28832620608. Its totient is φ = 13718046720.

The previous prime is 21100000157. The next prime is 21100000219. The reversal of 21100000197 is 79100000112.

It is not a de Polignac number, because 21100000197 - 2⁷ = 21100000069 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21100000157) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44898 + ... + 210275.

It is an arithmetic number, because the mean of its divisors is an integer number (1802038788).

Almost surely, 2^21100000197 is an apocalyptic number.

It is an amenable number.

21100000197 is a deficient number, since it is larger than the sum of its proper divisors (7732620411).

21100000197 is a wasteful number, since it uses less digits than its factorization.

21100000197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255860.

The product of its (nonzero) digits is 126, while the sum is 21.

The spelling of 21100000197 in words is "twenty-one billion, one hundred million, one hundred ninety-seven", and thus it is an aban number.