31404021222 has 64 divisors (see below), whose sum is σ = 76318792704. Its totient is φ = 8409692160.

The previous prime is 31404021163. The next prime is 31404021223. The reversal of 31404021222 is 22212040413.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31404021223) 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, 80823 + ... + 263325.

It is an arithmetic number, because the mean of its divisors is an integer number (1192481136).

Almost surely, 2^31404021222 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31404021222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38159396352).

31404021222 is an abundant number, since it is smaller than the sum of its proper divisors (44914771482).

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

31404021222 is a wasteful number, since it uses less digits than its factorization.

31404021222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182773.

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 31404021222 its reverse (22212040413), we get a palindrome (53616061635).

The spelling of 31404021222 in words is "thirty-one billion, four hundred four million, twenty-one thousand, two hundred twenty-two".