21120677 has 2 divisors, whose sum is σ = 21120678. Its totient is φ = 21120676.

The previous prime is 21120667. The next prime is 21120689. The reversal of 21120677 is 77602112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16394401 + 4726276 = 4049^2 + 2174^2 .

It is a cyclic number.

It is not a de Polignac number, because 21120677 - 2⁴ = 21120661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21120607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560338 + 10560339.

It is an arithmetic number, because the mean of its divisors is an integer number (10560339).

Almost surely, 2^21120677 is an apocalyptic number.

It is an amenable number.

21120677 is a deficient number, since it is larger than the sum of its proper divisors (1).

21120677 is an equidigital number, since it uses as much as digits as its factorization.

21120677 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1176, while the sum is 26.

The square root of 21120677 is about 4595.7237732483. The cubic root of 21120677 is about 276.4198826768.

Adding to 21120677 its reverse (77602112), we get a palindrome (98722789).

The spelling of 21120677 in words is "twenty-one million, one hundred twenty thousand, six hundred seventy-seven".