21101301197 has 2 divisors, whose sum is σ = 21101301198. Its totient is φ = 21101301196.

The previous prime is 21101301163. The next prime is 21101301209. The reversal of 21101301197 is 79110310112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17175150916 + 3926150281 = 131054^2 + 62659^2 .

It is a cyclic number.

It is not a de Polignac number, because 21101301197 - 2²⁸ = 20832865741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21101301497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550650598 + 10550650599.

It is an arithmetic number, because the mean of its divisors is an integer number (10550650599).

Almost surely, 2^21101301197 is an apocalyptic number.

It is an amenable number.

21101301197 is a deficient number, since it is larger than the sum of its proper divisors (1).

21101301197 is an equidigital number, since it uses as much as digits as its factorization.

21101301197 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 378, while the sum is 26.

The spelling of 21101301197 in words is "twenty-one billion, one hundred one million, three hundred one thousand, one hundred ninety-seven".