21201221110907 has 2 divisors, whose sum is σ = 21201221110908. Its totient is φ = 21201221110906.

The previous prime is 21201221110903. The next prime is 21201221110961. The reversal of 21201221110907 is 70901112210212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21201221110907 - 2² = 21201221110903 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21201221110907.

It is not a weakly prime, because it can be changed into another prime (21201221110903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10600610555453 + 10600610555454.

It is an arithmetic number, because the mean of its divisors is an integer number (10600610555454).

Almost surely, 2^{21201221110907} is an apocalyptic number.

21201221110907 is a deficient number, since it is larger than the sum of its proper divisors (1).

21201221110907 is an equidigital number, since it uses as much as digits as its factorization.

21201221110907 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 29.

The spelling of 21201221110907 in words is "twenty-one trillion, two hundred one billion, two hundred twenty-one million, one hundred ten thousand, nine hundred seven".