21021200122101 has 32 divisors (see below), whose sum is σ = 29864882396160. Its totient is φ = 13106295777024.

The previous prime is 21021200122079. The next prime is 21021200122121. The reversal of 21021200122101 is 10122100212012.

It is not a de Polignac number, because 21021200122101 - 2³⁰ = 21020126380277 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21021200122121) 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, 42808896 + ... + 43297158.

It is an arithmetic number, because the mean of its divisors is an integer number (933277574880).

Almost surely, 2^{21021200122101} is an apocalyptic number.

It is an amenable number.

21021200122101 is a deficient number, since it is larger than the sum of its proper divisors (8843682274059).

21021200122101 is a wasteful number, since it uses less digits than its factorization.

21021200122101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 493625.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21021200122101 its reverse (10122100212012), we get a palindrome (31143300334113).

The spelling of 21021200122101 in words is "twenty-one trillion, twenty-one billion, two hundred million, one hundred twenty-two thousand, one hundred one".