2031021121221 has 6 divisors (see below), whose sum is σ = 2933697175110. Its totient is φ = 1354014080808.

The previous prime is 2031021121219. The next prime is 2031021121223. The reversal of 2031021121221 is 1221211201302.

2031021121221 is a `hidden beast` number, since 20 + 310 + 2 + 112 + 1 + 221 = 666.

It is an interprime number because it is at equal distance from previous prime (2031021121219) and next prime (2031021121223).

It can be written as a sum of positive squares in only one way, i.e., 1923033960225 + 107987160996 = 1386735^2 + 328614^2 .

It is not a de Polignac number, because 2031021121221 - 2¹ = 2031021121219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2031021121194 and 2031021121203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2031021121223) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 112834506726 + ... + 112834506743.

It is an arithmetic number, because the mean of its divisors is an integer number (488949529185).

Almost surely, 2^{2031021121221} is an apocalyptic number.

It is an amenable number.

2031021121221 is a deficient number, since it is larger than the sum of its proper divisors (902676053889).

2031021121221 is a wasteful number, since it uses less digits than its factorization.

2031021121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225669013475 (or 225669013472 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 2031021121221 its reverse (1221211201302), we get a palindrome (3252232322523).

The spelling of 2031021121221 in words is "two trillion, thirty-one billion, twenty-one million, one hundred twenty-one thousand, two hundred twenty-one".