1020021201 has 16 divisors (see below), whose sum is σ = 1523046400. Its totient is φ = 674657424.

The previous prime is 1020021187. The next prime is 1020021209. The reversal of 1020021201 is 1021200201.

1020021201 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1020021201 - 2¹⁵ = 1019988433 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1020021209) 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, 145306 + ... + 152163.

It is an arithmetic number, because the mean of its divisors is an integer number (95190400).

Almost surely, 2^1020021201 is an apocalyptic number.

It is an amenable number.

1020021201 is a deficient number, since it is larger than the sum of its proper divisors (503025199).

1020021201 is a wasteful number, since it uses less digits than its factorization.

1020021201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 297605 (or 297599 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 1020021201 is about 31937.7707581478. The cubic root of 1020021201 is about 1006.6296838282.

Adding to 1020021201 its reverse (1021200201), we get a palindrome (2041221402).

The spelling of 1020021201 in words is "one billion, twenty million, twenty-one thousand, two hundred one".