1021021004 has 6 divisors (see below), whose sum is σ = 1786786764. Its totient is φ = 510510500.

The previous prime is 1021020961. The next prime is 1021021007. The reversal of 1021021004 is 4001201201.

It is not an unprimeable number, because it can be changed into a prime (1021021007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127627622 + ... + 127627629.

It is an arithmetic number, because the mean of its divisors is an integer number (297797794).

Almost surely, 2^1021021004 is an apocalyptic number.

It is an amenable number.

1021021004 is a deficient number, since it is larger than the sum of its proper divisors (765765760).

1021021004 is a wasteful number, since it uses less digits than its factorization.

1021021004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255255255 (or 255255253 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 1021021004 is about 31953.4192849529. The cubic root of 1021021004 is about 1006.9584687358.

Adding to 1021021004 its reverse (4001201201), we get a palindrome (5022222205).

The spelling of 1021021004 in words is "one billion, twenty-one million, twenty-one thousand, four".