21000120200107 has 2 divisors, whose sum is σ = 21000120200108. Its totient is φ = 21000120200106.

The previous prime is 21000120200093. The next prime is 21000120200159. The reversal of 21000120200107 is 70100202100012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21000120200107 - 2¹⁵ = 21000120167339 is a prime.

It is a super-2 number, since 2×21000120200107² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21000120200407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500060100053 + 10500060100054.

It is an arithmetic number, because the mean of its divisors is an integer number (10500060100054).

Almost surely, 2^{21000120200107} is an apocalyptic number.

21000120200107 is a deficient number, since it is larger than the sum of its proper divisors (1).

21000120200107 is an equidigital number, since it uses as much as digits as its factorization.

21000120200107 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 16.

Adding to 21000120200107 its reverse (70100202100012), we get a palindrome (91100322300119).

The spelling of 21000120200107 in words is "twenty-one trillion, one hundred twenty million, two hundred thousand, one hundred seven".