21202222011021 has 12 divisors (see below), whose sum is σ = 30625616612448. Its totient is φ = 14134729373064.

The previous prime is 21202222011001. The next prime is 21202222011031. The reversal of 21202222011021 is 12011022220212.

It is a happy number.

21202222011021 is a `hidden beast` number, since 212 + 0 + 222 + 201 + 10 + 21 = 666.

It is not a de Polignac number, because 21202222011021 - 2⁹ = 21202222010509 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21202222010985 and 21202222011003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21202222011001) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5515425 + ... + 8533718.

It is an arithmetic number, because the mean of its divisors is an integer number (2552134717704).

Almost surely, 2^{21202222011021} is an apocalyptic number.

It is an amenable number.

21202222011021 is a deficient number, since it is larger than the sum of its proper divisors (9423394601427).

21202222011021 is a wasteful number, since it uses less digits than its factorization.

21202222011021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14216832 (or 14216829 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21202222011021 its reverse (12011022220212), we get a palindrome (33213244231233).

The spelling of 21202222011021 in words is "twenty-one trillion, two hundred two billion, two hundred twenty-two million, eleven thousand, twenty-one".