20010101221 has 8 divisors (see below), whose sum is σ = 21988540224. Its totient is φ = 18058218720.

The previous prime is 20010101207. The next prime is 20010101227. The reversal of 20010101221 is 12210101002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20010101221 - 2¹⁹ = 20009576933 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20010101198 and 20010101207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20010101227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6637545 + ... + 6640558.

It is an arithmetic number, because the mean of its divisors is an integer number (2748567528).

Almost surely, 2^20010101221 is an apocalyptic number.

It is an amenable number.

20010101221 is a deficient number, since it is larger than the sum of its proper divisors (1978439003).

20010101221 is a wasteful number, since it uses less digits than its factorization.

20010101221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13278251.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 20010101221 its reverse (12210101002), we get a palindrome (32220202223).

The spelling of 20010101221 in words is "twenty billion, ten million, one hundred one thousand, two hundred twenty-one".