20651210001 has 12 divisors (see below), whose sum is σ = 29832071412. Its totient is φ = 13766298336.

The previous prime is 20651209979. The next prime is 20651210033. The reversal of 20651210001 is 10001215602.

20651210001 is a `hidden beast` number, since 2 + 0 + 651 + 2 + 10 + 0 + 0 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 9613606401 + 11037603600 = 98049^2 + 105060^2 .

It is not a de Polignac number, because 20651210001 - 2⁶ = 20651209937 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20651210101) 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 11 ways as a sum of consecutive naturals, for example, 20995 + ... + 204311.

It is an arithmetic number, because the mean of its divisors is an integer number (2486005951).

Almost surely, 2^20651210001 is an apocalyptic number.

It is an amenable number.

20651210001 is a deficient number, since it is larger than the sum of its proper divisors (9180861411).

20651210001 is a wasteful number, since it uses less digits than its factorization.

20651210001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195840 (or 195837 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

Adding to 20651210001 its reverse (10001215602), we get a palindrome (30652425603).

The spelling of 20651210001 in words is "twenty billion, six hundred fifty-one million, two hundred ten thousand, one".