21984821241937 has 2 divisors, whose sum is σ = 21984821241938. Its totient is φ = 21984821241936.

The previous prime is 21984821241919. The next prime is 21984821241949. The reversal of 21984821241937 is 73914212848912.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21474688178241 + 510133063696 = 4634079^2 + 714236^2 .

It is a cyclic number.

It is not a de Polignac number, because 21984821241937 - 2²³ = 21984812853329 is a prime.

It is not a weakly prime, because it can be changed into another prime (21984821241037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10992410620968 + 10992410620969.

It is an arithmetic number, because the mean of its divisors is an integer number (10992410620969).

Almost surely, 2^{21984821241937} is an apocalyptic number.

It is an amenable number.

21984821241937 is a deficient number, since it is larger than the sum of its proper divisors (1).

21984821241937 is an equidigital number, since it uses as much as digits as its factorization.

21984821241937 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13934592, while the sum is 61.

The spelling of 21984821241937 in words is "twenty-one trillion, nine hundred eighty-four billion, eight hundred twenty-one million, two hundred forty-one thousand, nine hundred thirty-seven".