21630220212 has 48 divisors (see below), whose sum is σ = 50785448000. Its totient is φ = 7165186560.

The previous prime is 21630220193. The next prime is 21630220223. The reversal of 21630220212 is 21202203612.

It is a super-2 number, since 2×21630220212² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 1789164 + ... + 1801212.

Almost surely, 2^21630220212 is an apocalyptic number.

It is an amenable number.

21630220212 is an abundant number, since it is smaller than the sum of its proper divisors (29155227788).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21630220212 is a wasteful number, since it uses less digits than its factorization.

21630220212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12976 (or 12974 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 21630220212 its reverse (21202203612), we get a palindrome (42832423824).

The spelling of 21630220212 in words is "twenty-one billion, six hundred thirty million, two hundred twenty thousand, two hundred twelve".