21022221213 has 24 divisors (see below), whose sum is σ = 34758412416. Its totient is φ = 11993637600.

The previous prime is 21022221211. The next prime is 21022221229. The reversal of 21022221213 is 31212222012.

21022221213 is a `hidden beast` number, since 210 + 22 + 221 + 213 = 666.

It is not a de Polignac number, because 21022221213 - 2¹ = 21022221211 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21022221211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 224658 + ... + 304163.

It is an arithmetic number, because the mean of its divisors is an integer number (1448267184).

Almost surely, 2^21022221213 is an apocalyptic number.

It is an amenable number.

21022221213 is a deficient number, since it is larger than the sum of its proper divisors (13736191203).

21022221213 is a wasteful number, since it uses less digits than its factorization.

21022221213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 529465 (or 529462 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 21022221213 its reverse (31212222012), we get a palindrome (52234443225).

The spelling of 21022221213 in words is "twenty-one billion, twenty-two million, two hundred twenty-one thousand, two hundred thirteen".