1221421330 has 16 divisors (see below), whose sum is σ = 2200941720. Its totient is φ = 488038912.

The previous prime is 1221421309. The next prime is 1221421339. The reversal of 1221421330 is 331241221.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 953018641 + 268402689 = 30871^2 + 16383^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1221421298 and 1221421307.

It is not an unprimeable number, because it can be changed into a prime (1221421339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56449 + ... + 75028.

Almost surely, 2^1221421330 is an apocalyptic number.

1221421330 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221421330 is a deficient number, since it is larger than the sum of its proper divisors (979520390).

1221421330 is a wasteful number, since it uses less digits than its factorization.

1221421330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132413.

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

The square root of 1221421330 is about 34948.8387503791. The cubic root of 1221421330 is about 1068.9445235794.

Adding to 1221421330 its reverse (331241221), we get a palindrome (1552662551).

The spelling of 1221421330 in words is "one billion, two hundred twenty-one million, four hundred twenty-one thousand, three hundred thirty".