20211002001 has 6 divisors (see below), whose sum is σ = 29193669570. Its totient is φ = 13474001328.

The previous prime is 20211001981. The next prime is 20211002047. The reversal of 20211002001 is 10020011202.

It can be written as a sum of positive squares in only one way, i.e., 17043563601 + 3167438400 = 130551^2 + 56280^2 .

It is not a de Polignac number, because 20211002001 - 2⁵ = 20211001969 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: 2245666889 = 20211002001 / (2 + 0 + 2 + 1 + 1 + 0 + 0 + 2 + 0 + 0 + 1).

It is not an unprimeable number, because it can be changed into a prime (20211002401) 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 5 ways as a sum of consecutive naturals, for example, 1122833436 + ... + 1122833453.

It is an arithmetic number, because the mean of its divisors is an integer number (4865611595).

Almost surely, 2^20211002001 is an apocalyptic number.

It is an amenable number.

20211002001 is a deficient number, since it is larger than the sum of its proper divisors (8982667569).

20211002001 is a wasteful number, since it uses less digits than its factorization.

20211002001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2245666895 (or 2245666892 counting only the distinct ones).

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

Adding to 20211002001 its reverse (10020011202), we get a palindrome (30231013203).

The spelling of 20211002001 in words is "twenty billion, two hundred eleven million, two thousand, one".