31220121003 has 4 divisors (see below), whose sum is σ = 41626828008. Its totient is φ = 20813414000.

The previous prime is 31220121001. The next prime is 31220121083. The reversal of 31220121003 is 30012102213.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 31220121003 - 2¹ = 31220121001 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31220121001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5203353498 + ... + 5203353503.

It is an arithmetic number, because the mean of its divisors is an integer number (10406707002).

Almost surely, 2^31220121003 is an apocalyptic number.

31220121003 is a deficient number, since it is larger than the sum of its proper divisors (10406707005).

31220121003 is a wasteful number, since it uses less digits than its factorization.

31220121003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10406707004.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 31220121003 its reverse (30012102213), we get a palindrome (61232223216).

The spelling of 31220121003 in words is "thirty-one billion, two hundred twenty million, one hundred twenty-one thousand, three".