10122011221 has 16 divisors (see below), whose sum is σ = 11944680448. Its totient is φ = 8393673600.

The previous prime is 10122011203. The next prime is 10122011231. The reversal of 10122011221 is 12211022101.

It is a cyclic number.

It is not a de Polignac number, because 10122011221 - 2⁷ = 10122011093 is a prime.

It is a super-2 number, since 2×10122011221² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10122011231) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1376671 + ... + 1384003.

It is an arithmetic number, because the mean of its divisors is an integer number (746542528).

Almost surely, 2^10122011221 is an apocalyptic number.

It is an amenable number.

10122011221 is a deficient number, since it is larger than the sum of its proper divisors (1822669227).

10122011221 is an equidigital number, since it uses as much as digits as its factorization.

10122011221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13732.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 10122011221 its reverse (12211022101), we get a palindrome (22333033322).

The spelling of 10122011221 in words is "ten billion, one hundred twenty-two million, eleven thousand, two hundred twenty-one".