1204343021 has 12 divisors (see below), whose sum is σ = 1401683580. Its totient is φ = 1031768640.

The previous prime is 1204343017. The next prime is 1204343029. The reversal of 1204343021 is 1203434021.

It can be written as a sum of positive squares in 2 ways, for example, as 201924100 + 1002418921 = 14210^2 + 31661^2 .

It is not a de Polignac number, because 1204343021 - 2² = 1204343017 is a prime.

It is a super-2 number, since 2×1204343021² = 2900884224462812882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1204342984 and 1204343002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1204343029) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 114575 + ... + 124643.

It is an arithmetic number, because the mean of its divisors is an integer number (116806965).

Almost surely, 2^1204343021 is an apocalyptic number.

It is an amenable number.

1204343021 is a deficient number, since it is larger than the sum of its proper divisors (197340559).

1204343021 is a wasteful number, since it uses less digits than its factorization.

1204343021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12524 (or 12517 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 1204343021 is about 34703.6456442259. The cubic root of 1204343021 is about 1063.9390113934.

Adding to 1204343021 its reverse (1203434021), we get a palindrome (2407777042).

The spelling of 1204343021 in words is "one billion, two hundred four million, three hundred forty-three thousand, twenty-one".