1021204394 has 12 divisors (see below), whose sum is σ = 1781897634. Its totient is φ = 437658984.

The previous prime is 1021204351. The next prime is 1021204409. The reversal of 1021204394 is 4934021201.

It can be written as a sum of positive squares in only one way, i.e., 1021122025 + 82369 = 31955^2 + 287^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5210129 + ... + 5210324.

Almost surely, 2^1021204394 is an apocalyptic number.

1021204394 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

1021204394 is a deficient number, since it is larger than the sum of its proper divisors (760693240).

1021204394 is a wasteful number, since it uses less digits than its factorization.

1021204394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10420469 (or 10420462 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 1021204394 is about 31956.2888020496. The cubic root of 1021204394 is about 1007.0187531824.

Adding to 1021204394 its reverse (4934021201), we get a palindrome (5955225595).

The spelling of 1021204394 in words is "one billion, twenty-one million, two hundred four thousand, three hundred ninety-four".