1002101221 has 4 divisors (see below), whose sum is σ = 1093201344. Its totient is φ = 911001100.

The previous prime is 1002101161. The next prime is 1002101239. The reversal of 1002101221 is 1221012001.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1002101221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1002101198 and 1002101207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1002101521) 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, 45550045 + ... + 45550066.

It is an arithmetic number, because the mean of its divisors is an integer number (273300336).

Almost surely, 2^1002101221 is an apocalyptic number.

1002101221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1002101221 is a deficient number, since it is larger than the sum of its proper divisors (91100123).

1002101221 is an equidigital number, since it uses as much as digits as its factorization.

1002101221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91100122.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 1002101221 is about 31655.9823887998. The cubic root of 1002101221 is about 1000.6999170019.

Adding to 1002101221 its reverse (1221012001), we get a palindrome (2223113222).

The spelling of 1002101221 in words is "one billion, two million, one hundred one thousand, two hundred twenty-one".