1231350535220 has 24 divisors (see below), whose sum is σ = 2784746595624. Its totient is φ = 454652505216.

The previous prime is 1231350535213. The next prime is 1231350535229. The reversal of 1231350535220 is 225350531321.

It can be written as a sum of positive squares in 4 ways, for example, as 154483585936 + 1076866949284 = 393044^2 + 1037722^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231350535229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2367981539 + ... + 2367982058.

It is an arithmetic number, because the mean of its divisors is an integer number (116031108151).

Almost surely, 2^{1231350535220} is an apocalyptic number.

1231350535220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1231350535220 is an abundant number, since it is smaller than the sum of its proper divisors (1553396060404).

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

1231350535220 is a wasteful number, since it uses less digits than its factorization.

1231350535220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4735963619 (or 4735963617 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 32.

The spelling of 1231350535220 in words is "one trillion, two hundred thirty-one billion, three hundred fifty million, five hundred thirty-five thousand, two hundred twenty".