21954447337 has 2 divisors, whose sum is σ = 21954447338. Its totient is φ = 21954447336.

The previous prime is 21954447323. The next prime is 21954447367. The reversal of 21954447337 is 73374445912.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21525584656 + 428862681 = 146716^2 + 20709^2 .

It is a cyclic number.

It is not a de Polignac number, because 21954447337 - 2¹⁵ = 21954414569 is a prime.

It is not a weakly prime, because it can be changed into another prime (21954447367) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10977223668 + 10977223669.

It is an arithmetic number, because the mean of its divisors is an integer number (10977223669).

Almost surely, 2^21954447337 is an apocalyptic number.

It is an amenable number.

21954447337 is a deficient number, since it is larger than the sum of its proper divisors (1).

21954447337 is an equidigital number, since it uses as much as digits as its factorization.

21954447337 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2540160, while the sum is 49.

The spelling of 21954447337 in words is "twenty-one billion, nine hundred fifty-four million, four hundred forty-seven thousand, three hundred thirty-seven".