20121022221 has 8 divisors (see below), whose sum is σ = 26988677184. Its totient is φ = 13333691040.

The previous prime is 20121022213. The next prime is 20121022241. The reversal of 20121022221 is 12222012102.

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

It is not a de Polignac number, because 20121022221 - 2³ = 20121022213 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20121022221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121022241) 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, 20080360 + ... + 20081361.

It is an arithmetic number, because the mean of its divisors is an integer number (3373584648).

Almost surely, 2^20121022221 is an apocalyptic number.

It is an amenable number.

20121022221 is a deficient number, since it is larger than the sum of its proper divisors (6867654963).

20121022221 is a wasteful number, since it uses less digits than its factorization.

20121022221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40161891.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 20121022221 its reverse (12222012102), we get a palindrome (32343034323).

The spelling of 20121022221 in words is "twenty billion, one hundred twenty-one million, twenty-two thousand, two hundred twenty-one".