1002102221 has 4 divisors (see below), whose sum is σ = 1036657500. Its totient is φ = 967546944.

The previous prime is 1002102149. The next prime is 1002102223. The reversal of 1002102221 is 1222012001.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1222012001 = 7 ⋅174573143.

It can be written as a sum of positive squares in 2 ways, for example, as 619312996 + 382789225 = 24886^2 + 19565^2 .

It is a cyclic number.

It is not a de Polignac number, because 1002102221 - 2²² = 997907917 is a prime.

It is a super-2 number, since 2×1002102221² = 2008417722666265682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1002102223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17277596 + ... + 17277653.

It is an arithmetic number, because the mean of its divisors is an integer number (259164375).

Almost surely, 2^1002102221 is an apocalyptic number.

It is an amenable number.

1002102221 is a deficient number, since it is larger than the sum of its proper divisors (34555279).

1002102221 is an equidigital number, since it uses as much as digits as its factorization.

1002102221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34555278.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 1002102221 is about 31655.9981835986. The cubic root of 1002102221 is about 1000.7002498690.

Adding to 1002102221 its reverse (1222012001), we get a palindrome (2224114222).

The spelling of 1002102221 in words is "one billion, two million, one hundred two thousand, two hundred twenty-one".