21772605137639 has 2 divisors, whose sum is σ = 21772605137640. Its totient is φ = 21772605137638.

The previous prime is 21772605137593. The next prime is 21772605137651. The reversal of 21772605137639 is 93673150627712.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21772605137639 - 2⁸ = 21772605137383 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21772605137669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10886302568819 + 10886302568820.

It is an arithmetic number, because the mean of its divisors is an integer number (10886302568820).

Almost surely, 2^{21772605137639} is an apocalyptic number.

21772605137639 is a deficient number, since it is larger than the sum of its proper divisors (1).

21772605137639 is an equidigital number, since it uses as much as digits as its factorization.

21772605137639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20003760, while the sum is 59.

The spelling of 21772605137639 in words is "twenty-one trillion, seven hundred seventy-two billion, six hundred five million, one hundred thirty-seven thousand, six hundred thirty-nine".