21102010110021 has 8 divisors (see below), whose sum is σ = 28262183944960. Its totient is φ = 14004921507552.

The previous prime is 21102010110011. The next prime is 21102010110031. The reversal of 21102010110021 is 12001101020112.

It is an interprime number because it is at equal distance from previous prime (21102010110011) and next prime (21102010110031).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21102010110021 - 2³⁸ = 20827132203077 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21102010109979 and 21102010110006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21102010110011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15771307336 + ... + 15771308673.

It is an arithmetic number, because the mean of its divisors is an integer number (3532772993120).

Almost surely, 2^{21102010110021} is an apocalyptic number.

It is an amenable number.

21102010110021 is a deficient number, since it is larger than the sum of its proper divisors (7160173834939).

21102010110021 is a wasteful number, since it uses less digits than its factorization.

21102010110021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31542616235.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21102010110021 its reverse (12001101020112), we get a palindrome (33103111130133).

The spelling of 21102010110021 in words is "twenty-one trillion, one hundred two billion, ten million, one hundred ten thousand, twenty-one".