21220110012021 has 16 divisors (see below), whose sum is σ = 30990830040000. Its totient is φ = 12855455422208.

The previous prime is 21220110011957. The next prime is 21220110012037. The reversal of 21220110012021 is 12021001102212.

It is a cyclic number.

It is not a de Polignac number, because 21220110012021 - 2⁶ = 21220110011957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220110012061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7173801771 + ... + 7173804728.

It is an arithmetic number, because the mean of its divisors is an integer number (1936926877500).

Almost surely, 2^{21220110012021} is an apocalyptic number.

It is an amenable number.

21220110012021 is a deficient number, since it is larger than the sum of its proper divisors (9770720027979).

21220110012021 is a wasteful number, since it uses less digits than its factorization.

21220110012021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14347606548.

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

Adding to 21220110012021 its reverse (12021001102212), we get a palindrome (33241111114233).

The spelling of 21220110012021 in words is "twenty-one trillion, two hundred twenty billion, one hundred ten million, twelve thousand, twenty-one".