1223665421 has 16 divisors (see below), whose sum is σ = 1360696320. Its totient is φ = 1091077680.

The previous prime is 1223665409. The next prime is 1223665453. The reversal of 1223665421 is 1245663221.

It is not a de Polignac number, because 1223665421 - 2³⁰ = 149923597 is a prime.

It is a super-2 number, since 2×1223665421² = 2994714125102214482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1223661421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 172670 + ... + 179616.

It is an arithmetic number, because the mean of its divisors is an integer number (85043520).

Almost surely, 2^1223665421 is an apocalyptic number.

1223665421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1223665421 is a deficient number, since it is larger than the sum of its proper divisors (137030899).

1223665421 is a wasteful number, since it uses less digits than its factorization.

1223665421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7264.

The product of its digits is 17280, while the sum is 32.

The square root of 1223665421 is about 34980.9293901692. The cubic root of 1223665421 is about 1069.5987726171.

The spelling of 1223665421 in words is "one billion, two hundred twenty-three million, six hundred sixty-five thousand, four hundred twenty-one".