21122031107 has 2 divisors, whose sum is σ = 21122031108. Its totient is φ = 21122031106.

The previous prime is 21122031103. The next prime is 21122031167. The reversal of 21122031107 is 70113022112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21122031107 - 2² = 21122031103 is a prime.

It is a super-2 number, since 2×21122031107² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21122031103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10561015553 + 10561015554.

It is an arithmetic number, because the mean of its divisors is an integer number (10561015554).

Almost surely, 2^21122031107 is an apocalyptic number.

21122031107 is a deficient number, since it is larger than the sum of its proper divisors (1).

21122031107 is an equidigital number, since it uses as much as digits as its factorization.

21122031107 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 168, while the sum is 20.

Adding to 21122031107 its reverse (70113022112), we get a palindrome (91235053219).

The spelling of 21122031107 in words is "twenty-one billion, one hundred twenty-two million, thirty-one thousand, one hundred seven".