21000012100197 has 16 divisors (see below), whose sum is σ = 30160240165440. Its totient is φ = 12920351524992.

The previous prime is 21000012100181. The next prime is 21000012100213. The reversal of 21000012100197 is 79100121000012.

It is an interprime number because it is at equal distance from previous prime (21000012100181) and next prime (21000012100213).

It is not a de Polignac number, because 21000012100197 - 2⁴ = 21000012100181 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000012100297) 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, 56747463 + ... + 57116324.

It is an arithmetic number, because the mean of its divisors is an integer number (1885015010340).

Almost surely, 2^{21000012100197} is an apocalyptic number.

It is an amenable number.

21000012100197 is a deficient number, since it is larger than the sum of its proper divisors (9160228065243).

21000012100197 is a wasteful number, since it uses less digits than its factorization.

21000012100197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113868532.

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

The spelling of 21000012100197 in words is "twenty-one trillion, twelve million, one hundred thousand, one hundred ninety-seven".