21121101100207 has 2 divisors, whose sum is σ = 21121101100208. Its totient is φ = 21121101100206.

The previous prime is 21121101100157. The next prime is 21121101100213. The reversal of 21121101100207 is 70200110112112.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21121101100207 is a prime.

It is a super-2 number, since 2×21121101100207² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21121101160207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560550550103 + 10560550550104.

It is an arithmetic number, because the mean of its divisors is an integer number (10560550550104).

Almost surely, 2^{21121101100207} is an apocalyptic number.

21121101100207 is a deficient number, since it is larger than the sum of its proper divisors (1).

21121101100207 is an equidigital number, since it uses as much as digits as its factorization.

21121101100207 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 19.

Adding to 21121101100207 its reverse (70200110112112), we get a palindrome (91321211212319).

The spelling of 21121101100207 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred one million, one hundred thousand, two hundred seven".