20101011221 has 8 divisors (see below), whose sum is σ = 21196156800. Its totient is φ = 19009585440.

The previous prime is 20101011173. The next prime is 20101011257. The reversal of 20101011221 is 12211010102.

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 20101011221 - 2¹⁰ = 20101010197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20101019221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 918845 + ... + 940466.

It is an arithmetic number, because the mean of its divisors is an integer number (2649519600).

Almost surely, 2^20101011221 is an apocalyptic number.

It is an amenable number.

20101011221 is a deficient number, since it is larger than the sum of its proper divisors (1095145579).

20101011221 is a wasteful number, since it uses less digits than its factorization.

20101011221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1859899.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 20101011221 its reverse (12211010102), we get a palindrome (32312021323).

The spelling of 20101011221 in words is "twenty billion, one hundred one million, eleven thousand, two hundred twenty-one".