20102120001 has 20 divisors (see below), whose sum is σ = 30032980692. Its totient is φ = 13399678368.

The previous prime is 20102119997. The next prime is 20102120057. The reversal of 20102120001 is 10002120102.

It can be written as a sum of positive squares in 2 ways, for example, as 16092191025 + 4009928976 = 126855^2 + 63324^2 .

It is not a de Polignac number, because 20102120001 - 2² = 20102119997 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20102120201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1036671 + ... + 1055883.

Almost surely, 2^20102120001 is an apocalyptic number.

It is an amenable number.

20102120001 is a deficient number, since it is larger than the sum of its proper divisors (9930860691).

20102120001 is a wasteful number, since it uses less digits than its factorization.

20102120001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32142 (or 32133 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 20102120001 its reverse (10002120102), we get a palindrome (30104240103).

The spelling of 20102120001 in words is "twenty billion, one hundred two million, one hundred twenty thousand, one".