1000331421 has 4 divisors (see below), whose sum is σ = 1333775232. Its totient is φ = 666887612.

The previous prime is 1000331419. The next prime is 1000331429. The reversal of 1000331421 is 1241330001.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1241330001 = 3 ⋅413776667.

It is a cyclic number.

It is not a de Polignac number, because 1000331421 - 2¹ = 1000331419 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1000331421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1000331429) 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, 166721901 + ... + 166721906.

It is an arithmetic number, because the mean of its divisors is an integer number (333443808).

Almost surely, 2^1000331421 is an apocalyptic number.

It is an amenable number.

1000331421 is a deficient number, since it is larger than the sum of its proper divisors (333443811).

1000331421 is an equidigital number, since it uses as much as digits as its factorization.

1000331421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333443810.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 1000331421 is about 31628.0163936975. The cubic root of 1000331421 is about 1000.1104614645.

Adding to 1000331421 its reverse (1241330001), we get a palindrome (2241661422).

The spelling of 1000331421 in words is "one billion, three hundred thirty-one thousand, four hundred twenty-one".