1221421003224 has 32 divisors (see below), whose sum is σ = 3053994762240. Its totient is φ = 407081367200.

The previous prime is 1221421003223. The next prime is 1221421003247. The reversal of 1221421003224 is 4223001241221.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a junction number, because it is equal to n+sod(n) for n = 1221421003194 and 1221421003203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221421003223) 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, 3516132 + ... + 3847859.

It is an arithmetic number, because the mean of its divisors is an integer number (95437336320).

Almost surely, 2^{1221421003224} is an apocalyptic number.

It is an amenable number.

1221421003224 is an abundant number, since it is smaller than the sum of its proper divisors (1832573759016).

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

1221421003224 is a wasteful number, since it uses less digits than its factorization.

1221421003224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7370911 (or 7370907 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

Adding to 1221421003224 its reverse (4223001241221), we get a palindrome (5444422244445).

The spelling of 1221421003224 in words is "one trillion, two hundred twenty-one billion, four hundred twenty-one million, three thousand, two hundred twenty-four".