21021102107 has 2 divisors, whose sum is σ = 21021102108. Its totient is φ = 21021102106.

The previous prime is 21021102079. The next prime is 21021102209. The reversal of 21021102107 is 70120112012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21021102107 - 2¹⁸ = 21020839963 is a prime.

It is not a weakly prime, because it can be changed into another prime (21021102607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10510551053 + 10510551054.

It is an arithmetic number, because the mean of its divisors is an integer number (10510551054).

Almost surely, 2^21021102107 is an apocalyptic number.

21021102107 is a deficient number, since it is larger than the sum of its proper divisors (1).

21021102107 is an equidigital number, since it uses as much as digits as its factorization.

21021102107 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56, while the sum is 17.

Adding to 21021102107 its reverse (70120112012), we get a palindrome (91141214119).

The spelling of 21021102107 in words is "twenty-one billion, twenty-one million, one hundred two thousand, one hundred seven".