21120607 has 2 divisors, whose sum is σ = 21120608. Its totient is φ = 21120606.

The previous prime is 21120587. The next prime is 21120629. The reversal of 21120607 is 70602112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21120607 - 2⁷ = 21120479 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21120637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560303 + 10560304.

It is an arithmetic number, because the mean of its divisors is an integer number (10560304).

Almost surely, 2^21120607 is an apocalyptic number.

21120607 is a deficient number, since it is larger than the sum of its proper divisors (1).

21120607 is an equidigital number, since it uses as much as digits as its factorization.

21120607 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 168, while the sum is 19.

The square root of 21120607 is about 4595.7161574666. The cubic root of 21120607 is about 276.4195772981.

Adding to 21120607 its reverse (70602112), we get a palindrome (91722719).

The spelling of 21120607 in words is "twenty-one million, one hundred twenty thousand, six hundred seven".