10001002221 has 48 divisors (see below), whose sum is σ = 16912896000. Its totient is φ = 5575560480.

The previous prime is 10001002213. The next prime is 10001002229. The reversal of 10001002221 is 12220010001.

It is an interprime number because it is at equal distance from previous prime (10001002213) and next prime (10001002229).

It is not a de Polignac number, because 10001002221 - 2³ = 10001002213 is a prime.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10001002229) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3333280 + ... + 3336278.

It is an arithmetic number, because the mean of its divisors is an integer number (352352000).

Almost surely, 2^10001002221 is an apocalyptic number.

It is an amenable number.

10001002221 is a deficient number, since it is larger than the sum of its proper divisors (6911893779).

10001002221 is a wasteful number, since it uses less digits than its factorization.

10001002221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4286 (or 4283 counting only the distinct ones).

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

Adding to 10001002221 its reverse (12220010001), we get a palindrome (22221012222).

The spelling of 10001002221 in words is "ten billion, one million, two thousand, two hundred twenty-one".