21221011120101 has 16 divisors (see below), whose sum is σ = 30471584142720. Its totient is φ = 13058917185600.

The previous prime is 21221011120097. The next prime is 21221011120103. The reversal of 21221011120101 is 10102111012212.

It is a happy number.

It is not a de Polignac number, because 21221011120101 - 2² = 21221011120097 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221011120103) 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, 338041 + ... + 6523518.

It is an arithmetic number, because the mean of its divisors is an integer number (1904474008920).

Almost surely, 2^{21221011120101} is an apocalyptic number.

It is an amenable number.

21221011120101 is a deficient number, since it is larger than the sum of its proper divisors (9250573022619).

21221011120101 is a wasteful number, since it uses less digits than its factorization.

21221011120101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6940876.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21221011120101 its reverse (10102111012212), we get a palindrome (31323122132313).

The spelling of 21221011120101 in words is "twenty-one trillion, two hundred twenty-one billion, eleven million, one hundred twenty thousand, one hundred one".