21221200101211 has 8 divisors (see below), whose sum is σ = 23715044016048. Its totient is φ = 18821463504000.

The previous prime is 21221200101137. The next prime is 21221200101217. The reversal of 21221200101211 is 11210100212212.

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 21221200101211 - 2⁹ = 21221200100699 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21221200101217) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23526828930 + ... + 23526829831.

It is an arithmetic number, because the mean of its divisors is an integer number (2964380502006).

Almost surely, 2^{21221200101211} is an apocalyptic number.

21221200101211 is a deficient number, since it is larger than the sum of its proper divisors (2493843914837).

21221200101211 is a wasteful number, since it uses less digits than its factorization.

21221200101211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47053658813.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21221200101211 its reverse (11210100212212), we get a palindrome (32431300313423).

The spelling of 21221200101211 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred million, one hundred one thousand, two hundred eleven".