20101220001 has 24 divisors (see below), whose sum is σ = 30307670016. Its totient is φ = 12813863040.

The previous prime is 20101219991. The next prime is 20101220011. The reversal of 20101220001 is 10002210102.

It is an interprime number because it is at equal distance from previous prime (20101219991) and next prime (20101220011).

It is not a de Polignac number, because 20101220001 - 2¹⁵ = 20101187233 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (20101220011) 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 23 ways as a sum of consecutive naturals, for example, 671136 + ... + 700446.

It is an arithmetic number, because the mean of its divisors is an integer number (1262819584).

Almost surely, 2^20101220001 is an apocalyptic number.

It is an amenable number.

20101220001 is a deficient number, since it is larger than the sum of its proper divisors (10206450015).

20101220001 is a wasteful number, since it uses less digits than its factorization.

20101220001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32653 (or 32650 counting only the distinct ones).

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

Adding to 20101220001 its reverse (10002210102), we get a palindrome (30103430103).

The spelling of 20101220001 in words is "twenty billion, one hundred one million, two hundred twenty thousand, one".