21202012222 has 4 divisors (see below), whose sum is σ = 31803018336. Its totient is φ = 10601006110.

The previous prime is 21202012211. The next prime is 21202012253. The reversal of 21202012222 is 22221020212.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 21202012196 and 21202012205.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5300503054 + ... + 5300503057.

It is an arithmetic number, because the mean of its divisors is an integer number (7950754584).

Almost surely, 2^21202012222 is an apocalyptic number.

21202012222 is a deficient number, since it is larger than the sum of its proper divisors (10601006114).

21202012222 is a wasteful number, since it uses less digits than its factorization.

21202012222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10601006113.

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 21202012222 its reverse (22221020212), we get a palindrome (43423032434).

The spelling of 21202012222 in words is "twenty-one billion, two hundred two million, twelve thousand, two hundred twenty-two".