1231321420 has 48 divisors (see below), whose sum is σ = 2957310720. Its totient is φ = 421861824.

The previous prime is 1231321381. The next prime is 1231321451. The reversal of 1231321420 is 241231321.

It is a happy number.

It is a super-3 number, since 3×1231321420³ (a number of 28 digits) contains 333 as substring.

It is a nialpdrome in base 14.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 281611 + ... + 285949.

It is an arithmetic number, because the mean of its divisors is an integer number (61610640).

Almost surely, 2^1231321420 is an apocalyptic number.

1231321420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1231321420 is an abundant number, since it is smaller than the sum of its proper divisors (1725989300).

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

1231321420 is a wasteful number, since it uses less digits than its factorization.

1231321420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6382 (or 6380 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 1231321420 is about 35090.1897971499. The cubic root of 1231321420 is about 1071.8248244893.

Adding to 1231321420 its reverse (241231321), we get a palindrome (1472552741).

Subtracting from 1231321420 its reverse (241231321), we obtain a palindrome (990090099).

It can be divided in two parts, 12313 and 21420, that added together give a palindrome (33733).

The spelling of 1231321420 in words is "one billion, two hundred thirty-one million, three hundred twenty-one thousand, four hundred twenty".