31421211323122 has 4 divisors (see below), whose sum is σ = 47131816984686. Its totient is φ = 15710605661560.

The previous prime is 31421211323081. The next prime is 31421211323129. The reversal of 31421211323122 is 22132311212413.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 18992068124121 + 12429143199001 = 4357989^2 + 3525499^2 .

It is not an unprimeable number, because it can be changed into a prime (31421211323129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7855302830779 + ... + 7855302830782.

Almost surely, 2^{31421211323122} is an apocalyptic number.

31421211323122 is a deficient number, since it is larger than the sum of its proper divisors (15710605661564).

31421211323122 is a wasteful number, since it uses less digits than its factorization.

31421211323122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15710605661563.

The product of its digits is 3456, while the sum is 28.

Adding to 31421211323122 its reverse (22132311212413), we get a palindrome (53553522535535).

The spelling of 31421211323122 in words is "thirty-one trillion, four hundred twenty-one billion, two hundred eleven million, three hundred twenty-three thousand, one hundred twenty-two".