20203312121 has 8 divisors (see below), whose sum is σ = 20548533600. Its totient is φ = 19858183840.

The previous prime is 20203312111. The next prime is 20203312127. The reversal of 20203312121 is 12121330202.

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-20203312121 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 20203312121.

It is not an unprimeable number, because it can be changed into a prime (20203312127) 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, 521810 + ... + 559188.

It is an arithmetic number, because the mean of its divisors is an integer number (2568566700).

Almost surely, 2^20203312121 is an apocalyptic number.

It is an amenable number.

20203312121 is a deficient number, since it is larger than the sum of its proper divisors (345221479).

20203312121 is an equidigital number, since it uses as much as digits as its factorization.

20203312121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46599.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 20203312121 its reverse (12121330202), we get a palindrome (32324642323).

The spelling of 20203312121 in words is "twenty billion, two hundred three million, three hundred twelve thousand, one hundred twenty-one".