21221210201121 has 48 divisors (see below), whose sum is σ = 36909054474240. Its totient is φ = 11477757840480.

The previous prime is 21221210201117. The next prime is 21221210201167. The reversal of 21221210201121 is 12110201212212.

21221210201121 is a `hidden beast` number, since 21 + 221 + 210 + 201 + 12 + 1 = 666.

It is not a de Polignac number, because 21221210201121 - 2² = 21221210201117 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21221210201094 and 21221210201103.

It is not an unprimeable number, because it can be changed into a prime (21221210101121) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6716275 + ... + 9356856.

It is an arithmetic number, because the mean of its divisors is an integer number (768938634880).

Almost surely, 2^{21221210201121} is an apocalyptic number.

21221210201121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21221210201121 is a deficient number, since it is larger than the sum of its proper divisors (15687844273119).

21221210201121 is a wasteful number, since it uses less digits than its factorization.

21221210201121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16074266 (or 16074263 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 21221210201121 its reverse (12110201212212), we get a palindrome (33331411413333).

The spelling of 21221210201121 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred ten million, two hundred one thousand, one hundred twenty-one".