20120221021121 has 8 divisors (see below), whose sum is σ = 21667970208360. Its totient is φ = 18572477530752.

The previous prime is 20120221021111. The next prime is 20120221021129. The reversal of 20120221021121 is 12112012202102.

It can be written as a sum of positive squares in 4 ways, for example, as 3041309284225 + 17078911736896 = 1743935^2 + 4132664^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20120221021121 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20120221021121.

It is not an unprimeable number, because it can be changed into a prime (20120221021129) 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 7 ways as a sum of consecutive naturals, for example, 8443061 + ... + 10560573.

It is an arithmetic number, because the mean of its divisors is an integer number (2708496276045).

Almost surely, 2^{20120221021121} is an apocalyptic number.

It is an amenable number.

20120221021121 is a deficient number, since it is larger than the sum of its proper divisors (1547749187239).

20120221021121 is a wasteful number, since it uses less digits than its factorization.

20120221021121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2848435.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 20120221021121 its reverse (12112012202102), we get a palindrome (32232233223223).

The spelling of 20120221021121 in words is "twenty trillion, one hundred twenty billion, two hundred twenty-one million, twenty-one thousand, one hundred twenty-one".