1021002201 has 24 divisors (see below), whose sum is σ = 1587146184. Its totient is φ = 630120960.

The previous prime is 1021002193. The next prime is 1021002247. The reversal of 1021002201 is 1022001201.

It can be written as a sum of positive squares in 4 ways, for example, as 259242201 + 761760000 = 16101^2 + 27600^2 .

It is not a de Polignac number, because 1021002201 - 2³ = 1021002193 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (1021002251) 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 in 23 ways as a sum of consecutive naturals, for example, 45366 + ... + 64031.

It is an arithmetic number, because the mean of its divisors is an integer number (66131091).

Almost surely, 2^1021002201 is an apocalyptic number.

It is an amenable number.

1021002201 is a deficient number, since it is larger than the sum of its proper divisors (566143983).

1021002201 is a wasteful number, since it uses less digits than its factorization.

1021002201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109481 (or 109478 counting only the distinct ones).

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

The square root of 1021002201 is about 31953.1250584352. The cubic root of 1021002201 is about 1006.9522873559.

Adding to 1021002201 its reverse (1022001201), we get a palindrome (2043003402).

The spelling of 1021002201 in words is "one billion, twenty-one million, two thousand, two hundred one".