1021604135 has 8 divisors (see below), whose sum is σ = 1237172640. Its totient is φ = 809784864.

The previous prime is 1021604131. The next prime is 1021604189. The reversal of 1021604135 is 5314061201.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1021604135 - 2² = 1021604131 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1021604135.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021604131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 936707 + ... + 937796.

It is an arithmetic number, because the mean of its divisors is an integer number (154646580).

Almost surely, 2^1021604135 is an apocalyptic number.

1021604135 is a deficient number, since it is larger than the sum of its proper divisors (215568505).

1021604135 is a wasteful number, since it uses less digits than its factorization.

1021604135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1874617.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 1021604135 is about 31962.5426867138. The cubic root of 1021604135 is about 1007.1501320956.

Adding to 1021604135 its reverse (5314061201), we get a palindrome (6335665336).

The spelling of 1021604135 in words is "one billion, twenty-one million, six hundred four thousand, one hundred thirty-five".