10100001221 has 8 divisors (see below), whose sum is σ = 10647634944. Its totient is φ = 9566231760.

The previous prime is 10100001217. The next prime is 10100001227. The reversal of 10100001221 is 12210000101.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 10100001221 - 2² = 10100001217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10100001199 and 10100001208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10100001227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3464570 + ... + 3467483.

It is an arithmetic number, because the mean of its divisors is an integer number (1330954368).

Almost surely, 2^10100001221 is an apocalyptic number.

It is an amenable number.

10100001221 is a deficient number, since it is larger than the sum of its proper divisors (547633723).

10100001221 is an equidigital number, since it uses as much as digits as its factorization.

10100001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6932131.

The product of its (nonzero) digits is 4, while the sum is 8.

Adding to 10100001221 its reverse (12210000101), we get a palindrome (22310001322).

The spelling of 10100001221 in words is "ten billion, one hundred million, one thousand, two hundred twenty-one".