21201944569049 has 2 divisors, whose sum is σ = 21201944569050. Its totient is φ = 21201944569048.

The previous prime is 21201944568991. The next prime is 21201944569061. The reversal of 21201944569049 is 94096544910212.

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., 20744335614025 + 457608955024 = 4554595^2 + 676468^2 .

It is a cyclic number.

It is not a de Polignac number, because 21201944569049 - 2²⁸ = 21201676133593 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21201944568985 and 21201944569003.

It is not a weakly prime, because it can be changed into another prime (21201944563049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10600972284524 + 10600972284525.

It is an arithmetic number, because the mean of its divisors is an integer number (10600972284525).

Almost surely, 2^{21201944569049} is an apocalyptic number.

It is an amenable number.

21201944569049 is a deficient number, since it is larger than the sum of its proper divisors (1).

21201944569049 is an equidigital number, since it uses as much as digits as its factorization.

21201944569049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5598720, while the sum is 56.

The spelling of 21201944569049 in words is "twenty-one trillion, two hundred one billion, nine hundred forty-four million, five hundred sixty-nine thousand, forty-nine".