21110020102021 has 8 divisors (see below), whose sum is σ = 21601035830880. Its totient is φ = 20619008238192.

The previous prime is 21110020101983. The next prime is 21110020102033. The reversal of 21110020102021 is 12020102001112.

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

It is a cyclic number.

It is not a de Polignac number, because 21110020102021 - 2⁷ = 21110020101893 is a prime.

It is a super-2 number, since 2×21110020102021² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21110020101992 and 21110020102010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21110020102091) 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, 12122610 + ... + 13754188.

It is an arithmetic number, because the mean of its divisors is an integer number (2700129478860).

Almost surely, 2^{21110020102021} is an apocalyptic number.

It is an amenable number.

21110020102021 is a deficient number, since it is larger than the sum of its proper divisors (491015728859).

21110020102021 is a wasteful number, since it uses less digits than its factorization.

21110020102021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1932515.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21110020102021 its reverse (12020102001112), we get a palindrome (33130122103133).

The spelling of 21110020102021 in words is "twenty-one trillion, one hundred ten billion, twenty million, one hundred two thousand, twenty-one".