21102101197 has 8 divisors (see below), whose sum is σ = 21126331800. Its totient is φ = 21077888064.

The previous prime is 21102101161. The next prime is 21102101201. The reversal of 21102101197 is 79110120112.

It can be written as a sum of positive squares in 4 ways, for example, as 4548962916 + 16553138281 = 67446^2 + 128659^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 21102101197 - 2¹¹ = 21102099149 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 (21102101117) 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, 5288079 + ... + 5292067.

It is an arithmetic number, because the mean of its divisors is an integer number (2640791475).

Almost surely, 2^21102101197 is an apocalyptic number.

It is an amenable number.

21102101197 is a deficient number, since it is larger than the sum of its proper divisors (24230603).

21102101197 is a wasteful number, since it uses less digits than its factorization.

21102101197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8735.

The product of its (nonzero) digits is 252, while the sum is 25.

The spelling of 21102101197 in words is "twenty-one billion, one hundred two million, one hundred one thousand, one hundred ninety-seven".