1001232421 has 4 divisors (see below), whose sum is σ = 1144265632. Its totient is φ = 858199212.

The previous prime is 1001232413. The next prime is 1001232437. The reversal of 1001232421 is 1242321001.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1001232421 - 2³ = 1001232413 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1001232395 and 1001232404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001232521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71516595 + ... + 71516608.

It is an arithmetic number, because the mean of its divisors is an integer number (286066408).

Almost surely, 2^1001232421 is an apocalyptic number.

It is an amenable number.

1001232421 is a deficient number, since it is larger than the sum of its proper divisors (143033211).

1001232421 is an equidigital number, since it uses as much as digits as its factorization.

1001232421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143033210.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 1001232421 is about 31642.2568885344. The cubic root of 1001232421 is about 1000.4106383531.

Adding to 1001232421 its reverse (1242321001), we get a palindrome (2243553422).

The spelling of 1001232421 in words is "one billion, one million, two hundred thirty-two thousand, four hundred twenty-one".