1221404043 has 8 divisors (see below), whose sum is σ = 1628723008. Its totient is φ = 814177224.

The previous prime is 1221404033. The next prime is 1221404057. The reversal of 1221404043 is 3404041221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1221404043 - 2⁹ = 1221403531 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221404033) 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, 18696 + ... + 52842.

It is an arithmetic number, because the mean of its divisors is an integer number (203590376).

Almost surely, 2^1221404043 is an apocalyptic number.

1221404043 is a deficient number, since it is larger than the sum of its proper divisors (407318965).

1221404043 is a wasteful number, since it uses less digits than its factorization.

1221404043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46073.

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 1221404043 is about 34948.5914308431. The cubic root of 1221404043 is about 1068.9394805663.

Adding to 1221404043 its reverse (3404041221), we get a palindrome (4625445264).

The spelling of 1221404043 in words is "one billion, two hundred twenty-one million, four hundred four thousand, forty-three".