20101011011221 has 16 divisors (see below), whose sum is σ = 24181832568960. Its totient is φ = 16322513981760.

The previous prime is 20101011011197. The next prime is 20101011011243. The reversal of 20101011011221 is 12211011010102.

It is a happy number.

It is not a de Polignac number, because 20101011011221 - 2²⁷ = 20100876793493 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 (20101011011281) 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, 23059491 + ... + 23915311.

It is an arithmetic number, because the mean of its divisors is an integer number (1511364535560).

Almost surely, 2^{20101011011221} is an apocalyptic number.

It is an amenable number.

20101011011221 is a deficient number, since it is larger than the sum of its proper divisors (4080821557739).

20101011011221 is a wasteful number, since it uses less digits than its factorization.

20101011011221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1032444.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 20101011011221 its reverse (12211011010102), we get a palindrome (32312022021323).

The spelling of 20101011011221 in words is "twenty trillion, one hundred one billion, eleven million, eleven thousand, two hundred twenty-one".