31821140121 has 8 divisors (see below), whose sum is σ = 43796838144. Its totient is φ = 20529767760.

The previous prime is 31821140101. The next prime is 31821140171. The reversal of 31821140121 is 12104112813.

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

It is not a de Polignac number, because 31821140121 - 2⁵ = 31821140089 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31821140091 and 31821140100.

It is not an unprimeable number, because it can be changed into a prime (31821140101) 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, 171081306 + ... + 171081491.

It is an arithmetic number, because the mean of its divisors is an integer number (5474604768).

Almost surely, 2^31821140121 is an apocalyptic number.

31821140121 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

31821140121 is a deficient number, since it is larger than the sum of its proper divisors (11975698023).

31821140121 is a wasteful number, since it uses less digits than its factorization.

31821140121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342162831.

The product of its (nonzero) digits is 384, while the sum is 24.

Adding to 31821140121 its reverse (12104112813), we get a palindrome (43925252934).

The spelling of 31821140121 in words is "thirty-one billion, eight hundred twenty-one million, one hundred forty thousand, one hundred twenty-one".