31212100320121 has 8 divisors (see below), whose sum is σ = 35671025461824. Its totient is φ = 26753188595280.

The previous prime is 31212100320103. The next prime is 31212100320143. The reversal of 31212100320121 is 12102300121213.

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

It is not a de Polignac number, because 31212100320121 - 2²¹ = 31212098222969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31212101320121) 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, 2256471 + ... + 8216803.

It is an arithmetic number, because the mean of its divisors is an integer number (4458878182728).

Almost surely, 2^{31212100320121} is an apocalyptic number.

It is an amenable number.

31212100320121 is a deficient number, since it is larger than the sum of its proper divisors (4458925141703).

31212100320121 is an equidigital number, since it uses as much as digits as its factorization.

31212100320121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6708431.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 31212100320121 its reverse (12102300121213), we get a palindrome (43314400441334).

The spelling of 31212100320121 in words is "thirty-one trillion, two hundred twelve billion, one hundred million, three hundred twenty thousand, one hundred twenty-one".