21910552249 has 2 divisors, whose sum is σ = 21910552250. Its totient is φ = 21910552248.

The previous prime is 21910552247. The next prime is 21910552253. The reversal of 21910552249 is 94225501912.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21726760000 + 183792249 = 147400^2 + 13557^2 .

It is a cyclic number.

It is not a de Polignac number, because 21910552249 - 2¹ = 21910552247 is a prime.

Together with 21910552247, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (21910552247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10955276124 + 10955276125.

It is an arithmetic number, because the mean of its divisors is an integer number (10955276125).

Almost surely, 2^21910552249 is an apocalyptic number.

It is an amenable number.

21910552249 is a deficient number, since it is larger than the sum of its proper divisors (1).

21910552249 is an equidigital number, since it uses as much as digits as its factorization.

21910552249 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64800, while the sum is 40.

The spelling of 21910552249 in words is "twenty-one billion, nine hundred ten million, five hundred fifty-two thousand, two hundred forty-nine".