21936077 has 2 divisors, whose sum is σ = 21936078. Its totient is φ = 21936076.

The previous prime is 21936067. The next prime is 21936091. The reversal of 21936077 is 77063912.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19945156 + 1990921 = 4466^2 + 1411^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21936077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21936017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10968038 + 10968039.

It is an arithmetic number, because the mean of its divisors is an integer number (10968039).

Almost surely, 2^21936077 is an apocalyptic number.

It is an amenable number.

21936077 is a deficient number, since it is larger than the sum of its proper divisors (1).

21936077 is an equidigital number, since it uses as much as digits as its factorization.

21936077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15876, while the sum is 35.

The square root of 21936077 is about 4683.5965880934. The cubic root of 21936077 is about 279.9322837947.

Adding to 21936077 its reverse (77063912), we get a palindrome (98999989).

The spelling of 21936077 in words is "twenty-one million, nine hundred thirty-six thousand, seventy-seven".