21077115733 has 2 divisors, whose sum is σ = 21077115734. Its totient is φ = 21077115732.

The previous prime is 21077115721. The next prime is 21077115743. The reversal of 21077115733 is 33751177012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19400868369 + 1676247364 = 139287^2 + 40942^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21077115733 is a prime.

It is a super-2 number, since 2×21077115733² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21077115692 and 21077115701.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21077115743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10538557866 + 10538557867.

It is an arithmetic number, because the mean of its divisors is an integer number (10538557867).

Almost surely, 2^21077115733 is an apocalyptic number.

It is an amenable number.

21077115733 is a deficient number, since it is larger than the sum of its proper divisors (1).

21077115733 is an equidigital number, since it uses as much as digits as its factorization.

21077115733 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30870, while the sum is 37.

The spelling of 21077115733 in words is "twenty-one billion, seventy-seven million, one hundred fifteen thousand, seven hundred thirty-three".