1243200421 has 8 divisors (see below), whose sum is σ = 1258674560. Its totient is φ = 1227791952.

The previous prime is 1243200397. The next prime is 1243200443. The reversal of 1243200421 is 1240023421.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1243200421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243200461) 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, 22240 + ... + 54598.

It is an arithmetic number, because the mean of its divisors is an integer number (157334320).

Almost surely, 2^1243200421 is an apocalyptic number.

It is an amenable number.

1243200421 is a deficient number, since it is larger than the sum of its proper divisors (15474139).

1243200421 is a wasteful number, since it uses less digits than its factorization.

1243200421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32835.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 1243200421 is about 35259.0473637618. The cubic root of 1243200421 is about 1075.2605594471.

Adding to 1243200421 its reverse (1240023421), we get a palindrome (2483223842).

The spelling of 1243200421 in words is "one billion, two hundred forty-three million, two hundred thousand, four hundred twenty-one".