31221223000 has 64 divisors (see below), whose sum is σ = 79699295520. Its totient is φ = 11353168000.

The previous prime is 31221222983. The next prime is 31221223009. The reversal of 31221223000 is 32212213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31221223009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1408147 + ... + 1430146.

Almost surely, 2^31221223000 is an apocalyptic number.

It is an amenable number.

31221223000 is an abundant number, since it is smaller than the sum of its proper divisors (48478072520).

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

31221223000 is a wasteful number, since it uses less digits than its factorization.

31221223000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2838325 (or 2838311 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 31221223000 its reverse (32212213), we get a palindrome (31253435213).

The spelling of 31221223000 in words is "thirty-one billion, two hundred twenty-one million, two hundred twenty-three thousand".