1021606001 has 16 divisors (see below), whose sum is σ = 1136549904. Its totient is φ = 912155904.

The previous prime is 1021605953. The next prime is 1021606031. The reversal of 1021606001 is 1006061201.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 739600 + 1020866401 = 860^2 + 31951^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1021606001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1021606031) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77075 + ... + 89351.

It is an arithmetic number, because the mean of its divisors is an integer number (71034369).

Almost surely, 2^1021606001 is an apocalyptic number.

It is an amenable number.

1021606001 is a deficient number, since it is larger than the sum of its proper divisors (114943903).

1021606001 is a wasteful number, since it uses less digits than its factorization.

1021606001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12500.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 1021606001 is about 31962.5718771190. The cubic root of 1021606001 is about 1007.1507452950.

Adding to 1021606001 its reverse (1006061201), we get a palindrome (2027667202).

The spelling of 1021606001 in words is "one billion, twenty-one million, six hundred six thousand, one".