20121321101 has 16 divisors (see below), whose sum is σ = 23400862848. Its totient is φ = 16945656000.

The previous prime is 20121321097. The next prime is 20121321161. The reversal of 20121321101 is 10112312102.

It is not a de Polignac number, because 20121321101 - 2² = 20121321097 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 (20121321161) 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, 16010 + ... + 201243.

It is an arithmetic number, because the mean of its divisors is an integer number (1462553928).

Almost surely, 2^20121321101 is an apocalyptic number.

It is an amenable number.

20121321101 is a deficient number, since it is larger than the sum of its proper divisors (3279541747).

20121321101 is a wasteful number, since it uses less digits than its factorization.

20121321101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217492.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 20121321101 its reverse (10112312102), we get a palindrome (30233633203).

The spelling of 20121321101 in words is "twenty billion, one hundred twenty-one million, three hundred twenty-one thousand, one hundred one".