1031212321128 has 96 divisors (see below), whose sum is σ = 3058619391360. Its totient is φ = 311272611840.

The previous prime is 1031212321127. The next prime is 1031212321133. The reversal of 1031212321128 is 8211232121301.

It is a happy number.

1031212321128 is a `hidden beast` number, since 1 + 0 + 3 + 1 + 212 + 321 + 128 = 666.

It is not an unprimeable number, because it can be changed into a prime (1031212321127) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2329600 + ... + 2736687.

It is an arithmetic number, because the mean of its divisors is an integer number (31860618660).

Almost surely, 2^{1031212321128} is an apocalyptic number.

1031212321128 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1031212321128 is an abundant number, since it is smaller than the sum of its proper divisors (2027407070232).

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

1031212321128 is a wasteful number, since it uses less digits than its factorization.

1031212321128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5066567 (or 5066560 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

Adding to 1031212321128 its reverse (8211232121301), we get a palindrome (9242444442429).

It can be divided in two parts, 103121 and 2321128, that added together give a square (2424249 = 1557²).

The spelling of 1031212321128 in words is "one trillion, thirty-one billion, two hundred twelve million, three hundred twenty-one thousand, one hundred twenty-eight".