31012221021 has 8 divisors (see below), whose sum is σ = 43525924320. Its totient is φ = 19586665872.

The previous prime is 31012220957. The next prime is 31012221029. The reversal of 31012221021 is 12012221013.

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

It is not a de Polignac number, because 31012221021 - 2⁶ = 31012220957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31012221029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 272036970 + ... + 272037083.

It is an arithmetic number, because the mean of its divisors is an integer number (5440740540).

Almost surely, 2^31012221021 is an apocalyptic number.

It is an amenable number.

31012221021 is a deficient number, since it is larger than the sum of its proper divisors (12513703299).

31012221021 is a wasteful number, since it uses less digits than its factorization.

31012221021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 544074075.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 31012221021 its reverse (12012221013), we get a palindrome (43024442034).

The spelling of 31012221021 in words is "thirty-one billion, twelve million, two hundred twenty-one thousand, twenty-one".