21010022210221 has 4 divisors (see below), whose sum is σ = 22920024229344. Its totient is φ = 19100020191100.

The previous prime is 21010022210207. The next prime is 21010022210251. The reversal of 21010022210221 is 12201222001012.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21010022210221 - 2⁵ = 21010022210189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21010022210195 and 21010022210204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010022210251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 955001009545 + ... + 955001009566.

It is an arithmetic number, because the mean of its divisors is an integer number (5730006057336).

Almost surely, 2^{21010022210221} is an apocalyptic number.

It is an amenable number.

21010022210221 is a deficient number, since it is larger than the sum of its proper divisors (1910002019123).

21010022210221 is a wasteful number, since it uses less digits than its factorization.

21010022210221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1910002019122.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21010022210221 its reverse (12201222001012), we get a palindrome (33211244211233).

The spelling of 21010022210221 in words is "twenty-one trillion, ten billion, twenty-two million, two hundred ten thousand, two hundred twenty-one".