21110221021021 has 32 divisors (see below), whose sum is σ = 23519257200000. Its totient is φ = 18786816046080.

The previous prime is 21110221021003. The next prime is 21110221021037. The reversal of 21110221021021 is 12012012201112.

It is a cyclic number.

It is not a de Polignac number, because 21110221021021 - 2⁷ = 21110221020893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21110221020986 and 21110221021004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21110221021061) 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, 824959695 + ... + 824985283.

It is an arithmetic number, because the mean of its divisors is an integer number (734976787500).

Almost surely, 2^{21110221021021} is an apocalyptic number.

It is an amenable number.

21110221021021 is a deficient number, since it is larger than the sum of its proper divisors (2409036178979).

21110221021021 is a wasteful number, since it uses less digits than its factorization.

21110221021021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33309.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21110221021021 its reverse (12012012201112), we get a palindrome (33122233222133).

The spelling of 21110221021021 in words is "twenty-one trillion, one hundred ten billion, two hundred twenty-one million, twenty-one thousand, twenty-one".