21762288749 has 2 divisors, whose sum is σ = 21762288750. Its totient is φ = 21762288748.

The previous prime is 21762288733. The next prime is 21762288763. The reversal of 21762288749 is 94788226712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16109955625 + 5652333124 = 126925^2 + 75182^2 .

It is a cyclic number.

It is not a de Polignac number, because 21762288749 - 2⁴ = 21762288733 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21762288694 and 21762288703.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21762288049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10881144374 + 10881144375.

It is an arithmetic number, because the mean of its divisors is an integer number (10881144375).

Almost surely, 2^21762288749 is an apocalyptic number.

It is an amenable number.

21762288749 is a deficient number, since it is larger than the sum of its proper divisors (1).

21762288749 is an equidigital number, since it uses as much as digits as its factorization.

21762288749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5419008, while the sum is 56.

The spelling of 21762288749 in words is "twenty-one billion, seven hundred sixty-two million, two hundred eighty-eight thousand, seven hundred forty-nine".