21120220907 has 2 divisors, whose sum is σ = 21120220908. Its totient is φ = 21120220906.

The previous prime is 21120220853. The next prime is 21120220921. The reversal of 21120220907 is 70902202112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21120220907 - 2¹² = 21120216811 is a prime.

It is not a weakly prime, because it can be changed into another prime (21120220937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560110453 + 10560110454.

It is an arithmetic number, because the mean of its divisors is an integer number (10560110454).

Almost surely, 2^21120220907 is an apocalyptic number.

21120220907 is a deficient number, since it is larger than the sum of its proper divisors (1).

21120220907 is an equidigital number, since it uses as much as digits as its factorization.

21120220907 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 26.

The spelling of 21120220907 in words is "twenty-one billion, one hundred twenty million, two hundred twenty thousand, nine hundred seven".