1221432403 has 2 divisors, whose sum is σ = 1221432404. Its totient is φ = 1221432402.

The previous prime is 1221432397. The next prime is 1221432409. The reversal of 1221432403 is 3042341221.

It is a balanced prime because it is at equal distance from previous prime (1221432397) and next prime (1221432409).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221432403 is a prime.

It is not a weakly prime, because it can be changed into another prime (1221432409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610716201 + 610716202.

It is an arithmetic number, because the mean of its divisors is an integer number (610716202).

Almost surely, 2^1221432403 is an apocalyptic number.

1221432403 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221432403 is an equidigital number, since it uses as much as digits as its factorization.

1221432403 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 1221432403 is about 34948.9971673008. The cubic root of 1221432403 is about 1068.9477538016.

Adding to 1221432403 its reverse (3042341221), we get a palindrome (4263773624).

The spelling of 1221432403 in words is "one billion, two hundred twenty-one million, four hundred thirty-two thousand, four hundred three".