20121122122001 has 4 divisors (see below), whose sum is σ = 20265878396400. Its totient is φ = 19976365847604.

The previous prime is 20121122121979. The next prime is 20121122122021. The reversal of 20121122122001 is 10022122112102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20121122122001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20121122122021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72378136991 + ... + 72378137268.

It is an arithmetic number, because the mean of its divisors is an integer number (5066469599100).

Almost surely, 2^{20121122122001} is an apocalyptic number.

It is an amenable number.

20121122122001 is a deficient number, since it is larger than the sum of its proper divisors (144756274399).

20121122122001 is a wasteful number, since it uses less digits than its factorization.

20121122122001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144756274398.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 20121122122001 its reverse (10022122112102), we get a palindrome (30143244234103).

The spelling of 20121122122001 in words is "twenty trillion, one hundred twenty-one billion, one hundred twenty-two million, one hundred twenty-two thousand, one".