20100220001 has 4 divisors (see below), whose sum is σ = 20295367872. Its totient is φ = 19905072132.

The previous prime is 20100219973. The next prime is 20100220009. The reversal of 20100220001 is 10002200102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 10002200102 = 2 ⋅5001100051.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20100220001 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20100220009) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 97573781 + ... + 97573986.

It is an arithmetic number, because the mean of its divisors is an integer number (5073841968).

Almost surely, 2^20100220001 is an apocalyptic number.

It is an amenable number.

20100220001 is a deficient number, since it is larger than the sum of its proper divisors (195147871).

20100220001 is a wasteful number, since it uses less digits than its factorization.

20100220001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195147870.

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

Adding to 20100220001 its reverse (10002200102), we get a palindrome (30102420103).

The spelling of 20100220001 in words is "twenty billion, one hundred million, two hundred twenty thousand, one".