20312002232121 has 48 divisors (see below), whose sum is σ = 30309441015744. Its totient is φ = 12056059588608.

The previous prime is 20312002232111. The next prime is 20312002232131. The reversal of 20312002232121 is 12123220021302.

It is an interprime number because it is at equal distance from previous prime (20312002232111) and next prime (20312002232131).

It is not a de Polignac number, because 20312002232121 - 2⁷ = 20312002231993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20312002232111) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 11570950 + ... + 13210256.

It is an arithmetic number, because the mean of its divisors is an integer number (631446687828).

Almost surely, 2^{20312002232121} is an apocalyptic number.

It is an amenable number.

20312002232121 is a deficient number, since it is larger than the sum of its proper divisors (9997438783623).

20312002232121 is a wasteful number, since it uses less digits than its factorization.

20312002232121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1640038 (or 1640019 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 20312002232121 its reverse (12123220021302), we get a palindrome (32435222253423).

The spelling of 20312002232121 in words is "twenty trillion, three hundred twelve billion, two million, two hundred thirty-two thousand, one hundred twenty-one".