20120021222021 has 4 divisors (see below), whose sum is σ = 22994309968032. Its totient is φ = 17245732476012.

The previous prime is 20120021222009. The next prime is 20120021222027. The reversal of 20120021222021 is 12022212002102.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20120021222021 - 2¹⁴ = 20120021205637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20120021222027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1437144372995 + ... + 1437144373008.

It is an arithmetic number, because the mean of its divisors is an integer number (5748577492008).

Almost surely, 2^{20120021222021} is an apocalyptic number.

It is an amenable number.

20120021222021 is a deficient number, since it is larger than the sum of its proper divisors (2874288746011).

20120021222021 is an equidigital number, since it uses as much as digits as its factorization.

20120021222021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2874288746010.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 20120021222021 its reverse (12022212002102), we get a palindrome (32142233224123).

The spelling of 20120021222021 in words is "twenty trillion, one hundred twenty billion, twenty-one million, two hundred twenty-two thousand, twenty-one".