31000221032121 has 16 divisors (see below), whose sum is σ = 50101367325120. Its totient is φ = 18788012746560.

The previous prime is 31000221032107. The next prime is 31000221032153. The reversal of 31000221032121 is 12123012200013.

31000221032121 is a `hidden beast` number, since 3 + 100 + 0 + 221 + 0 + 321 + 21 = 666.

It is not a de Polignac number, because 31000221032121 - 2⁶ = 31000221032057 is a prime.

It is a super-2 number, since 2×31000221032121² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31000221032094 and 31000221032103.

It is not an unprimeable number, because it can be changed into a prime (31000221052121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52188924000 + ... + 52188924593.

It is an arithmetic number, because the mean of its divisors is an integer number (3131335457820).

Almost surely, 2^{31000221032121} is an apocalyptic number.

It is an amenable number.

31000221032121 is a deficient number, since it is larger than the sum of its proper divisors (19101146292999).

31000221032121 is a wasteful number, since it uses less digits than its factorization.

31000221032121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104377848613 (or 104377848607 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 31000221032121 its reverse (12123012200013), we get a palindrome (43123233232134).

The spelling of 31000221032121 in words is "thirty-one trillion, two hundred twenty-one million, thirty-two thousand, one hundred twenty-one".