21121021110101 has 16 divisors (see below), whose sum is σ = 23245621056000. Its totient is φ = 19030966921200.

The previous prime is 21121021110071. The next prime is 21121021110113. The reversal of 21121021110101 is 10101112012112.

It is a cyclic number.

It is not a de Polignac number, because 21121021110101 - 2²⁶ = 21120954001237 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121021110401) 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, 10614695 + ... + 12446436.

It is an arithmetic number, because the mean of its divisors is an integer number (1452851316000).

Almost surely, 2^{21121021110101} is an apocalyptic number.

It is an amenable number.

21121021110101 is a deficient number, since it is larger than the sum of its proper divisors (2124599945899).

21121021110101 is a wasteful number, since it uses less digits than its factorization.

21121021110101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23061880.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 21121021110101 its reverse (10101112012112), we get a palindrome (31222133122213).

The spelling of 21121021110101 in words is "twenty-one trillion, one hundred twenty-one billion, twenty-one million, one hundred ten thousand, one hundred one".