9021101221 has 32 divisors (see below), whose sum is σ = 10720988928. Its totient is φ = 7498583040.

The previous prime is 9021101209. The next prime is 9021101227. The reversal of 9021101221 is 1221011209.

It is a happy number.

It is not a de Polignac number, because 9021101221 - 2⁵ = 9021101189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9021101227) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1016415 + ... + 1025251.

It is an arithmetic number, because the mean of its divisors is an integer number (335030904).

Almost surely, 2^9021101221 is an apocalyptic number.

It is an amenable number.

9021101221 is a deficient number, since it is larger than the sum of its proper divisors (1699887707).

9021101221 is a wasteful number, since it uses less digits than its factorization.

9021101221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9021.

The product of its (nonzero) digits is 72, while the sum is 19.

The square root of 9021101221 is about 94979.4778939114. The cubic root of 9021101221 is about 2081.7081952759.

The spelling of 9021101221 in words is "nine billion, twenty-one million, one hundred one thousand, two hundred twenty-one".