20312121003 has 8 divisors (see below), whose sum is σ = 27232457616. Its totient is φ = 13466599200.

The previous prime is 20312120993. The next prime is 20312121017. The reversal of 20312121003 is 30012121302.

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

It is not a de Polignac number, because 20312121003 - 2⁴ = 20312120987 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20312121503) 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, 18703068 + ... + 18704153.

It is an arithmetic number, because the mean of its divisors is an integer number (3404057202).

Almost surely, 2^20312121003 is an apocalyptic number.

20312121003 is a deficient number, since it is larger than the sum of its proper divisors (6920336613).

20312121003 is a wasteful number, since it uses less digits than its factorization.

20312121003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37407405.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 20312121003 its reverse (30012121302), we get a palindrome (50324242305).

The spelling of 20312121003 in words is "twenty billion, three hundred twelve million, one hundred twenty-one thousand, three".