21000221220101 has 32 divisors (see below), whose sum is σ = 22108287836160. Its totient is φ = 19921417214400.

The previous prime is 21000221220089. The next prime is 21000221220107. The reversal of 21000221220101 is 10102212200012.

It is a cyclic number.

It is not a de Polignac number, because 21000221220101 - 2⁶ = 21000221220037 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000221220107) 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, 1185975290 + ... + 1185992996.

It is an arithmetic number, because the mean of its divisors is an integer number (690883994880).

Almost surely, 2^{21000221220101} is an apocalyptic number.

It is an amenable number.

21000221220101 is a deficient number, since it is larger than the sum of its proper divisors (1108066616059).

21000221220101 is a wasteful number, since it uses less digits than its factorization.

21000221220101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19905.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21000221220101 its reverse (10102212200012), we get a palindrome (31102433420113).

The spelling of 21000221220101 in words is "twenty-one trillion, two hundred twenty-one million, two hundred twenty thousand, one hundred one".