20010010221 has 6 divisors (see below), whose sum is σ = 28903348110. Its totient is φ = 13340006808.

The previous prime is 20010010211. The next prime is 20010010247. The reversal of 20010010221 is 12201001002.

It can be written as a sum of positive squares in only one way, i.e., 14624064900 + 5385945321 = 120930^2 + 73389^2 .

It is not a de Polignac number, because 20010010221 - 2³³ = 11420075629 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: 2223334469 = 20010010221 / (2 + 0 + 0 + 1 + 0 + 0 + 1 + 0 + 2 + 2 + 1).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20010010211) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1111667226 + ... + 1111667243.

It is an arithmetic number, because the mean of its divisors is an integer number (4817224685).

Almost surely, 2^20010010221 is an apocalyptic number.

It is an amenable number.

20010010221 is a deficient number, since it is larger than the sum of its proper divisors (8893337889).

20010010221 is a wasteful number, since it uses less digits than its factorization.

20010010221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2223334475 (or 2223334472 counting only the distinct ones).

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

Adding to 20010010221 its reverse (12201001002), we get a palindrome (32211011223).

The spelling of 20010010221 in words is "twenty billion, ten million, ten thousand, two hundred twenty-one".