31244421012 has 96 divisors (see below), whose sum is σ = 86326732800. Its totient is φ = 8605629312.

The previous prime is 31244421011. The next prime is 31244421037. The reversal of 31244421012 is 21012444213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31244421011) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1595593 + ... + 1615055.

It is an arithmetic number, because the mean of its divisors is an integer number (899236800).

Almost surely, 2^31244421012 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31244421012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43163366400).

31244421012 is an abundant number, since it is smaller than the sum of its proper divisors (55082311788).

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

31244421012 is a wasteful number, since it uses less digits than its factorization.

31244421012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20165 (or 20163 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

Adding to 31244421012 its reverse (21012444213), we get a palindrome (52256865225).

The spelling of 31244421012 in words is "thirty-one billion, two hundred forty-four million, four hundred twenty-one thousand, twelve".