21220021022 has 8 divisors (see below), whose sum is σ = 31920202656. Its totient is φ = 10579953472.

The previous prime is 21220021003. The next prime is 21220021033. The reversal of 21220021022 is 22012002212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 21220020988 and 21220021006.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15027638 + ... + 15029049.

It is an arithmetic number, because the mean of its divisors is an integer number (3990025332).

Almost surely, 2^21220021022 is an apocalyptic number.

21220021022 is a deficient number, since it is larger than the sum of its proper divisors (10700181634).

21220021022 is a wasteful number, since it uses less digits than its factorization.

21220021022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30057042.

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 21220021022 its reverse (22012002212), we get a palindrome (43232023234).

The spelling of 21220021022 in words is "twenty-one billion, two hundred twenty million, twenty-one thousand, twenty-two".