1243022421 has 8 divisors (see below), whose sum is σ = 1660960224. Its totient is φ = 826883120.

The previous prime is 1243022411. The next prime is 1243022441. The reversal of 1243022421 is 1242203421.

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

It is a cyclic number.

It is not a de Polignac number, because 1243022421 - 2¹³ = 1243014229 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243022401) 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, 448011 + ... + 450776.

It is an arithmetic number, because the mean of its divisors is an integer number (207620028).

Almost surely, 2^1243022421 is an apocalyptic number.

It is an amenable number.

1243022421 is a deficient number, since it is larger than the sum of its proper divisors (417937803).

1243022421 is an equidigital number, since it uses as much as digits as its factorization.

1243022421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 899251.

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

The square root of 1243022421 is about 35256.5230985700. The cubic root of 1243022421 is about 1075.2092388094.

Adding to 1243022421 its reverse (1242203421), we get a palindrome (2485225842).

The spelling of 1243022421 in words is "one billion, two hundred forty-three million, twenty-two thousand, four hundred twenty-one".