1021601001 has 16 divisors (see below), whose sum is σ = 1406935040. Its totient is φ = 658694160.

The previous prime is 1021600999. The next prime is 1021601029. The reversal of 1021601001 is 1001061201.

It is a happy number.

It is not a de Polignac number, because 1021601001 - 2¹ = 1021600999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1021608001) 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, 258720 + ... + 262638.

It is an arithmetic number, because the mean of its divisors is an integer number (87933440).

Almost surely, 2^1021601001 is an apocalyptic number.

It is an amenable number.

1021601001 is a deficient number, since it is larger than the sum of its proper divisors (385334039).

1021601001 is a wasteful number, since it uses less digits than its factorization.

1021601001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6756.

The product of its (nonzero) digits is 12, while the sum is 12.

The square root of 1021601001 is about 31962.4936605391. The cubic root of 1021601001 is about 1007.1491022082.

Adding to 1021601001 its reverse (1001061201), we get a palindrome (2022662202).

The spelling of 1021601001 in words is "one billion, twenty-one million, six hundred one thousand, one".