21112210121207 has 2 divisors, whose sum is σ = 21112210121208. Its totient is φ = 21112210121206.

The previous prime is 21112210121131. The next prime is 21112210121213. The reversal of 21112210121207 is 70212101221112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21112210121207 - 2¹⁴ = 21112210104823 is a prime.

It is a super-2 number, since 2×21112210121207² (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 (21112210121227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10556105060603 + 10556105060604.

It is an arithmetic number, because the mean of its divisors is an integer number (10556105060604).

Almost surely, 2^{21112210121207} is an apocalyptic number.

21112210121207 is a deficient number, since it is larger than the sum of its proper divisors (1).

21112210121207 is an equidigital number, since it uses as much as digits as its factorization.

21112210121207 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 224, while the sum is 23.

Adding to 21112210121207 its reverse (70212101221112), we get a palindrome (91324311342319).

The spelling of 21112210121207 in words is "twenty-one trillion, one hundred twelve billion, two hundred ten million, one hundred twenty-one thousand, two hundred seven".