1221432530 has 16 divisors (see below), whose sum is σ = 2258000280. Its totient is φ = 475368192.

The previous prime is 1221432523. The next prime is 1221432631. The reversal of 1221432530 is 352341221.

It can be written as a sum of positive squares in 4 ways, for example, as 1217242321 + 4190209 = 34889^2 + 2047^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1221432496 and 1221432505.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1650215 + ... + 1650954.

Almost surely, 2^1221432530 is an apocalyptic number.

1221432530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221432530 is a deficient number, since it is larger than the sum of its proper divisors (1036567750).

1221432530 is a wasteful number, since it uses less digits than its factorization.

1221432530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3301213.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 1221432530 is about 34948.9989842342. The cubic root of 1221432530 is about 1068.9477908500.

Adding to 1221432530 its reverse (352341221), we get a palindrome (1573773751).

It can be divided in two parts, 12214 and 32530, that added together give a palindrome (44744).

The spelling of 1221432530 in words is "one billion, two hundred twenty-one million, four hundred thirty-two thousand, five hundred thirty".