1231021004 has 12 divisors (see below), whose sum is σ = 2184629328. Its totient is φ = 606841200.

The previous prime is 1231020929. The next prime is 1231021009. The reversal of 1231021004 is 4001201321.

It is a self number, because there is not a number n which added to its sum of digits gives 1231021004.

It is not an unprimeable number, because it can be changed into a prime (1231021009) 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, 2167007 + ... + 2167574.

It is an arithmetic number, because the mean of its divisors is an integer number (182052444).

Almost surely, 2^1231021004 is an apocalyptic number.

It is an amenable number.

1231021004 is a deficient number, since it is larger than the sum of its proper divisors (953608324).

1231021004 is a wasteful number, since it uses less digits than its factorization.

1231021004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4334656 (or 4334654 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 1231021004 is about 35085.9089094183. The cubic root of 1231021004 is about 1071.7376499814.

Adding to 1231021004 its reverse (4001201321), we get a palindrome (5232222325).

The spelling of 1231021004 in words is "one billion, two hundred thirty-one million, twenty-one thousand, four".