21574111737617 has 2 divisors, whose sum is σ = 21574111737618. Its totient is φ = 21574111737616.

The previous prime is 21574111737439. The next prime is 21574111737649. The reversal of 21574111737617 is 71673711147512.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21159116809216 + 414994928401 = 4599904^2 + 644201^2 .

It is a cyclic number.

It is not a de Polignac number, because 21574111737617 - 2²⁶ = 21574044628753 is a prime.

It is a super-2 number, since 2×21574111737617² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21574111737677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10787055868808 + 10787055868809.

It is an arithmetic number, because the mean of its divisors is an integer number (10787055868809).

Almost surely, 2^{21574111737617} is an apocalyptic number.

It is an amenable number.

21574111737617 is a deficient number, since it is larger than the sum of its proper divisors (1).

21574111737617 is an equidigital number, since it uses as much as digits as its factorization.

21574111737617 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728720, while the sum is 53.

The spelling of 21574111737617 in words is "twenty-one trillion, five hundred seventy-four billion, one hundred eleven million, seven hundred thirty-seven thousand, six hundred seventeen".