21021101120221 has 16 divisors (see below), whose sum is σ = 22737009816576. Its totient is φ = 19358671188736.

The previous prime is 21021101120183. The next prime is 21021101120263. The reversal of 21021101120221 is 12202110112012.

It is a cyclic number.

It is not a de Polignac number, because 21021101120221 - 2⁹ = 21021101119709 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21021101120195 and 21021101120204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21021101123221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 228661 + ... + 6488026.

It is an arithmetic number, because the mean of its divisors is an integer number (1421063113536).

Almost surely, 2^{21021101120221} is an apocalyptic number.

It is an amenable number.

21021101120221 is a deficient number, since it is larger than the sum of its proper divisors (1715908696355).

21021101120221 is a wasteful number, since it uses less digits than its factorization.

21021101120221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6720668.

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

Adding to 21021101120221 its reverse (12202110112012), we get a palindrome (33223211232233).

The spelling of 21021101120221 in words is "twenty-one trillion, twenty-one billion, one hundred one million, one hundred twenty thousand, two hundred twenty-one".