20120221221121 has 16 divisors (see below), whose sum is σ = 23621783651584. Its totient is φ = 16775697875904.

The previous prime is 20120221221119. The next prime is 20120221221131. The reversal of 20120221221121 is 12112212202102.

It is a cyclic number.

It is not a de Polignac number, because 20120221221121 - 2¹ = 20120221221119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20120221221131) 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, 8429805 + ... + 10549978.

It is an arithmetic number, because the mean of its divisors is an integer number (1476361478224).

Almost surely, 2^{20120221221121} is an apocalyptic number.

It is an amenable number.

20120221221121 is a deficient number, since it is larger than the sum of its proper divisors (3501562430463).

20120221221121 is a wasteful number, since it uses less digits than its factorization.

20120221221121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18983920.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 20120221221121 its reverse (12112212202102), we get a palindrome (32232433423223).

The spelling of 20120221221121 in words is "twenty trillion, one hundred twenty billion, two hundred twenty-one million, two hundred twenty-one thousand, one hundred twenty-one".