21846347197 has 2 divisors, whose sum is σ = 21846347198. Its totient is φ = 21846347196.

The previous prime is 21846347177. The next prime is 21846347203. The reversal of 21846347197 is 79174364812.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17291987001 + 4554360196 = 131499^2 + 67486^2 .

It is a cyclic number.

It is not a de Polignac number, because 21846347197 - 2²⁷ = 21712129469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21846347177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10923173598 + 10923173599.

It is an arithmetic number, because the mean of its divisors is an integer number (10923173599).

Almost surely, 2^21846347197 is an apocalyptic number.

It is an amenable number.

21846347197 is a deficient number, since it is larger than the sum of its proper divisors (1).

21846347197 is an equidigital number, since it uses as much as digits as its factorization.

21846347197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2032128, while the sum is 52.

The spelling of 21846347197 in words is "twenty-one billion, eight hundred forty-six million, three hundred forty-seven thousand, one hundred ninety-seven".