21522541049 has 2 divisors, whose sum is σ = 21522541050. Its totient is φ = 21522541048.

The previous prime is 21522541039. The next prime is 21522541097. The reversal of 21522541049 is 94014522512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17395763449 + 4126777600 = 131893^2 + 64240^2 .

It is a cyclic number.

It is not a de Polignac number, because 21522541049 - 2¹² = 21522536953 is a prime.

It is not a weakly prime, because it can be changed into another prime (21522541039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10761270524 + 10761270525.

It is an arithmetic number, because the mean of its divisors is an integer number (10761270525).

Almost surely, 2^21522541049 is an apocalyptic number.

It is an amenable number.

21522541049 is a deficient number, since it is larger than the sum of its proper divisors (1).

21522541049 is an equidigital number, since it uses as much as digits as its factorization.

21522541049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28800, while the sum is 35.

The spelling of 21522541049 in words is "twenty-one billion, five hundred twenty-two million, five hundred forty-one thousand, forty-nine".