31103003011221 has 24 divisors (see below), whose sum is σ = 45119958363480. Its totient is φ = 20646101145600.

The previous prime is 31103003011219. The next prime is 31103003011229. The reversal of 31103003011221 is 12211030030113.

31103003011221 is a `hidden beast` number, since 3 + 110 + 30 + 0 + 301 + 1 + 221 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 20586537743121 + 10516465268100 = 4537239^2 + 3242910^2 .

It is not a de Polignac number, because 31103003011221 - 2¹ = 31103003011219 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 31103003011194 and 31103003011203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31103003011229) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12950995 + ... + 15163583.

It is an arithmetic number, because the mean of its divisors is an integer number (1879998265145).

Almost surely, 2^{31103003011221} is an apocalyptic number.

It is an amenable number.

31103003011221 is a deficient number, since it is larger than the sum of its proper divisors (14016955352259).

31103003011221 is a wasteful number, since it uses less digits than its factorization.

31103003011221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2219317 (or 2219314 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 31103003011221 its reverse (12211030030113), we get a palindrome (43314033041334).

The spelling of 31103003011221 in words is "thirty-one trillion, one hundred three billion, three million, eleven thousand, two hundred twenty-one".