31021230006 has 72 divisors (see below), whose sum is σ = 74556013896. Its totient is φ = 9312151680.

The previous prime is 31021229999. The next prime is 31021230041. The reversal of 31021230006 is 60003212013.

It is a super-2 number, since 2×31021230006² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 361 + ... + 249083.

It is an arithmetic number, because the mean of its divisors is an integer number (1035500193).

Almost surely, 2^31021230006 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31021230006, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37278006948).

31021230006 is an abundant number, since it is smaller than the sum of its proper divisors (43534783890).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31021230006 is a wasteful number, since it uses less digits than its factorization.

31021230006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248798 (or 248782 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 31021230006 its reverse (60003212013), we get a palindrome (91024442019).

The spelling of 31021230006 in words is "thirty-one billion, twenty-one million, two hundred thirty thousand, six".