1221341430 has 32 divisors (see below), whose sum is σ = 2936412000. Its totient is φ = 325114112.

The previous prime is 1221341419. The next prime is 1221341447. The reversal of 1221341430 is 341431221.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1221341397 and 1221341406.

It is a congruent number.

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, 18705 + ... + 52844.

It is an arithmetic number, because the mean of its divisors is an integer number (91762875).

Almost surely, 2^1221341430 is an apocalyptic number.

1221341430 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221341430 is an abundant number, since it is smaller than the sum of its proper divisors (1715070570).

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

1221341430 is a wasteful number, since it uses less digits than its factorization.

1221341430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72128.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 1221341430 is about 34947.6956321873. The cubic root of 1221341430 is about 1068.9212145246.

Adding to 1221341430 its reverse (341431221), we get a palindrome (1562772651).

The spelling of 1221341430 in words is "one billion, two hundred twenty-one million, three hundred forty-one thousand, four hundred thirty".