21204221131101 has 32 divisors (see below), whose sum is σ = 30145022208000. Its totient is φ = 13219109324928.

The previous prime is 21204221131031. The next prime is 21204221131123. The reversal of 21204221131101 is 10113112240212.

It is not a de Polignac number, because 21204221131101 - 2¹⁰ = 21204221130077 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21204221131141) 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, 16393801 + ... + 17639873.

It is an arithmetic number, because the mean of its divisors is an integer number (942031944000).

Almost surely, 2^{21204221131101} is an apocalyptic number.

It is an amenable number.

21204221131101 is a deficient number, since it is larger than the sum of its proper divisors (8940801076899).

21204221131101 is a wasteful number, since it uses less digits than its factorization.

21204221131101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1249953.

The product of its (nonzero) digits is 192, while the sum is 21.

Adding to 21204221131101 its reverse (10113112240212), we get a palindrome (31317333371313).

It can be divided in two parts, 2120422 and 1131101, that added together give a palindrome (3251523).

The spelling of 21204221131101 in words is "twenty-one trillion, two hundred four billion, two hundred twenty-one million, one hundred thirty-one thousand, one hundred one".