20121201001 has 32 divisors (see below), whose sum is σ = 23687769600. Its totient is φ = 16894241280.

The previous prime is 20121200989. The next prime is 20121201017. The reversal of 20121201001 is 10010212102.

It is a cyclic number.

It is not a de Polignac number, because 20121201001 - 2⁷ = 20121200873 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20121201091) 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 31 ways as a sum of consecutive naturals, for example, 5561145 + ... + 5564761.

It is an arithmetic number, because the mean of its divisors is an integer number (740242800).

Almost surely, 2^20121201001 is an apocalyptic number.

It is an amenable number.

20121201001 is a deficient number, since it is larger than the sum of its proper divisors (3566568599).

20121201001 is a wasteful number, since it uses less digits than its factorization.

20121201001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4309.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 20121201001 its reverse (10010212102), we get a palindrome (30131413103).

It can be divided in two parts, 20121 and 201001, that added together give a palindrome (221122).

The spelling of 20121201001 in words is "twenty billion, one hundred twenty-one million, two hundred one thousand, one".