21220202512 has 20 divisors (see below), whose sum is σ = 41136221776. Its totient is φ = 10604403360.

The previous prime is 21220202503. The next prime is 21220202533. The reversal of 21220202512 is 21520202212.

It is a super-2 number, since 2×21220202512² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21220202512.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 325314 + ... + 385057.

Almost surely, 2^21220202512 is an apocalyptic number.

It is an amenable number.

21220202512 is a deficient number, since it is larger than the sum of its proper divisors (19916019264).

21220202512 is a wasteful number, since it uses less digits than its factorization.

21220202512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 712246 (or 712240 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 19.

Adding to 21220202512 its reverse (21520202212), we get a palindrome (42740404724).

The spelling of 21220202512 in words is "twenty-one billion, two hundred twenty million, two hundred two thousand, five hundred twelve".