20120012001 has 6 divisors (see below), whose sum is σ = 29062239570. Its totient is φ = 13413341328.

The previous prime is 20120011999. The next prime is 20120012047. The reversal of 20120012001 is 10021002102.

It can be written as a sum of positive squares in only one way, i.e., 12723840000 + 7396172001 = 112800^2 + 86001^2 .

It is not a de Polignac number, because 20120012001 - 2¹ = 20120011999 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 2235556889 = 20120012001 / (2 + 0 + 1 + 2 + 0 + 0 + 1 + 2 + 0 + 0 + 1).

It is not an unprimeable number, because it can be changed into a prime (20120012201) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1117778436 + ... + 1117778453.

It is an arithmetic number, because the mean of its divisors is an integer number (4843706595).

Almost surely, 2^20120012001 is an apocalyptic number.

It is an amenable number.

20120012001 is a deficient number, since it is larger than the sum of its proper divisors (8942227569).

20120012001 is a wasteful number, since it uses less digits than its factorization.

20120012001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2235556895 (or 2235556892 counting only the distinct ones).

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

Adding to 20120012001 its reverse (10021002102), we get a palindrome (30141014103).

The spelling of 20120012001 in words is "twenty billion, one hundred twenty million, twelve thousand, one".