10010101221 has 24 divisors (see below), whose sum is σ = 14931471360. Its totient is φ = 6455527200.

The previous prime is 10010101217. The next prime is 10010101223. The reversal of 10010101221 is 12210101001.

It is a happy number.

It is not a de Polignac number, because 10010101221 - 2² = 10010101217 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 (10010101223) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 881860 + ... + 893138.

It is an arithmetic number, because the mean of its divisors is an integer number (622144640).

Almost surely, 2^10010101221 is an apocalyptic number.

It is an amenable number.

10010101221 is a deficient number, since it is larger than the sum of its proper divisors (4921370139).

10010101221 is a wasteful number, since it uses less digits than its factorization.

10010101221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14497 (or 14494 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 10010101221 its reverse (12210101001), we get a palindrome (22220202222).

The spelling of 10010101221 in words is "ten billion, ten million, one hundred one thousand, two hundred twenty-one".