20010120221 has 16 divisors (see below), whose sum is σ = 25698618624. Its totient is φ = 15143825664.

The previous prime is 20010120217. The next prime is 20010120239. The reversal of 20010120221 is 12202101002.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20010120221 - 2² = 20010120217 is a prime.

It is a super-2 number, since 2×20010120221² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20010120211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4778156 + ... + 4782341.

It is an arithmetic number, because the mean of its divisors is an integer number (1606163664).

Almost surely, 2^20010120221 is an apocalyptic number.

It is an amenable number.

20010120221 is a deficient number, since it is larger than the sum of its proper divisors (5688498403).

20010120221 is a wasteful number, since it uses less digits than its factorization.

20010120221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9560540.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 20010120221 its reverse (12202101002), we get a palindrome (32212221223).

The spelling of 20010120221 in words is "twenty billion, ten million, one hundred twenty thousand, two hundred twenty-one".