20010221001 has 12 divisors (see below), whose sum is σ = 29518624512. Its totient is φ = 13056314136.

The previous prime is 20010220987. The next prime is 20010221039. The reversal of 20010221001 is 10012201002.

It is not a de Polignac number, because 20010221001 - 2¹⁹ = 20009696713 is a prime.

It is a super-2 number, since 2×20010221001² (a number of 21 digits) contains 22 as substring.

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 (20010221401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23652321 + ... + 23653166.

It is an arithmetic number, because the mean of its divisors is an integer number (2459885376).

Almost surely, 2^20010221001 is an apocalyptic number.

It is an amenable number.

20010221001 is a deficient number, since it is larger than the sum of its proper divisors (9508403511).

20010221001 is a wasteful number, since it uses less digits than its factorization.

20010221001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47305540 (or 47305537 counting only the distinct ones).

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

Adding to 20010221001 its reverse (10012201002), we get a palindrome (30022422003).

The spelling of 20010221001 in words is "twenty billion, ten million, two hundred twenty-one thousand, one".