20021112121 has 8 divisors (see below), whose sum is σ = 20279059200. Its totient is φ = 19763278080.

The previous prime is 20021112103. The next prime is 20021112173. The reversal of 20021112121 is 12121112002.

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

It is a cyclic number.

It is not a de Polignac number, because 20021112121 - 2⁹ = 20021111609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20021712121) 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, 362841 + ... + 414361.

It is an arithmetic number, because the mean of its divisors is an integer number (2534882400).

Almost surely, 2^20021112121 is an apocalyptic number.

It is an amenable number.

20021112121 is a deficient number, since it is larger than the sum of its proper divisors (257947079).

20021112121 is an equidigital number, since it uses as much as digits as its factorization.

20021112121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56519.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 20021112121 its reverse (12121112002), we get a palindrome (32142224123).

The spelling of 20021112121 in words is "twenty billion, twenty-one million, one hundred twelve thousand, one hundred twenty-one".