1231232213420 has 48 divisors (see below), whose sum is σ = 2846518567200. Its totient is φ = 443613265920.

The previous prime is 1231232213411. The next prime is 1231232213437. The reversal of 1231232213420 is 243122321321.

It is a super-2 number, since 2×1231232213420² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1231232213420.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25648085 + ... + 25696044.

It is an arithmetic number, because the mean of its divisors is an integer number (59302470150).

Almost surely, 2^{1231232213420} is an apocalyptic number.

1231232213420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1231232213420 is an abundant number, since it is smaller than the sum of its proper divisors (1615286353780).

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

1231232213420 is a wasteful number, since it uses less digits than its factorization.

1231232213420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51344258 (or 51344256 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 26.

Adding to 1231232213420 its reverse (243122321321), we get a palindrome (1474354534741).

The spelling of 1231232213420 in words is "one trillion, two hundred thirty-one billion, two hundred thirty-two million, two hundred thirteen thousand, four hundred twenty".