1221423300420 has 24 divisors (see below), whose sum is σ = 3419985241344. Its totient is φ = 325712880096.

The previous prime is 1221423300407. The next prime is 1221423300443. The reversal of 1221423300420 is 240033241221.

It is a happy number.

It is an unprimeable number.

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, 10178527444 + ... + 10178527563.

It is an arithmetic number, because the mean of its divisors is an integer number (142499385056).

Almost surely, 2^{1221423300420} is an apocalyptic number.

1221423300420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221423300420 is an abundant number, since it is smaller than the sum of its proper divisors (2198561940924).

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

1221423300420 is a wasteful number, since it uses less digits than its factorization.

1221423300420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20357055019 (or 20357055017 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 1221423300420 its reverse (240033241221), we get a palindrome (1461456541641).

The spelling of 1221423300420 in words is "one trillion, two hundred twenty-one billion, four hundred twenty-three million, three hundred thousand, four hundred twenty".