21001101000197 has 16 divisors (see below), whose sum is σ = 21499540930560. Its totient is φ = 20503120084272.

The previous prime is 21001101000181. The next prime is 21001101000223. The reversal of 21001101000197 is 79100010110012.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21001101000197 - 2⁴ = 21001101000181 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21001101000107) 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, 1035189788 + ... + 1035210074.

It is an arithmetic number, because the mean of its divisors is an integer number (1343721308160).

Almost surely, 2^{21001101000197} is an apocalyptic number.

It is an amenable number.

21001101000197 is a deficient number, since it is larger than the sum of its proper divisors (498439930363).

21001101000197 is a wasteful number, since it uses less digits than its factorization.

21001101000197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30392.

The product of its (nonzero) digits is 126, while the sum is 23.

The spelling of 21001101000197 in words is "twenty-one trillion, one billion, one hundred one million, one hundred ninety-seven", and thus it is an aban number.