1221004231420 has 24 divisors (see below), whose sum is σ = 2564194598784. Its totient is φ = 488385366336.

The previous prime is 1221004231399. The next prime is 1221004231429. The reversal of 1221004231420 is 241324001221.

It is a junction number, because it is equal to n+sod(n) for n = 1221004231391 and 1221004231400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221004231429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 397867 + ... + 1612546.

It is an arithmetic number, because the mean of its divisors is an integer number (106841441616).

Almost surely, 2^{1221004231420} is an apocalyptic number.

1221004231420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221004231420 is an abundant number, since it is smaller than the sum of its proper divisors (1343190367364).

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

1221004231420 is a wasteful number, since it uses less digits than its factorization.

1221004231420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2040789 (or 2040787 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 1221004231420 its reverse (241324001221), we get a palindrome (1462328232641).

The spelling of 1221004231420 in words is "one trillion, two hundred twenty-one billion, four million, two hundred thirty-one thousand, four hundred twenty".