31211320030 has 32 divisors (see below), whose sum is σ = 62944115040. Its totient is φ = 11042824320.

The previous prime is 31211319947. The next prime is 31211320037. The reversal of 31211320030 is 3002311213.

It is a junction number, because it is equal to n+sod(n) for n = 31211319986 and 31211320013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31211320037) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3830245 + ... + 3838384.

It is an arithmetic number, because the mean of its divisors is an integer number (1967003595).

Almost surely, 2^31211320030 is an apocalyptic number.

31211320030 is an abundant number, since it is smaller than the sum of its proper divisors (31732795010).

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

31211320030 is a wasteful number, since it uses less digits than its factorization.

31211320030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7668684.

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 31211320030 its reverse (3002311213), we get a palindrome (34213631243).

The spelling of 31211320030 in words is "thirty-one billion, two hundred eleven million, three hundred twenty thousand, thirty".