21100110020021 has 8 divisors (see below), whose sum is σ = 22050815512704. Its totient is φ = 20152180311120.

The previous prime is 21100110019943. The next prime is 21100110020053. The reversal of 21100110020021 is 12002001100112.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21100110020021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21100110019984 and 21100110020011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21100110020071) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 693930401 + ... + 693960806.

It is an arithmetic number, because the mean of its divisors is an integer number (2756351939088).

Almost surely, 2^{21100110020021} is an apocalyptic number.

It is an amenable number.

21100110020021 is a deficient number, since it is larger than the sum of its proper divisors (950705492683).

21100110020021 is a wasteful number, since it uses less digits than its factorization.

21100110020021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1387891891.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21100110020021 its reverse (12002001100112), we get a palindrome (33102111120133).

The spelling of 21100110020021 in words is "twenty-one trillion, one hundred billion, one hundred ten million, twenty thousand, twenty-one".