31220321123000 has 128 divisors (see below), whose sum is σ = 76648452042240. Its totient is φ = 11887165440000.

The previous prime is 31220321122973. The next prime is 31220321123011. The reversal of 31220321123000 is 32112302213.

It is a super-2 number, since 2×31220321123000² (a number of 28 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6363977 + ... + 10145976.

It is an arithmetic number, because the mean of its divisors is an integer number (598816031580).

Almost surely, 2^{31220321123000} is an apocalyptic number.

It is an amenable number.

31220321123000 is an abundant number, since it is smaller than the sum of its proper divisors (45428130919240).

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

31220321123000 is a wasteful number, since it uses less digits than its factorization.

31220321123000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16510066 (or 16510052 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 31220321123000 its reverse (32112302213), we get a palindrome (31252433425213).

The spelling of 31220321123000 in words is "thirty-one trillion, two hundred twenty billion, three hundred twenty-one million, one hundred twenty-three thousand".