21022201212 has 48 divisors (see below), whose sum is σ = 49792216320. Its totient is φ = 6902228608.

The previous prime is 21022201177. The next prime is 21022201253. The reversal of 21022201212 is 21210222012.

It is a junction number, because it is equal to n+sod(n) for n = 21022201191 and 21022201200.

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, 243463 + ... + 318305.

It is an arithmetic number, because the mean of its divisors is an integer number (1037337840).

Almost surely, 2^21022201212 is an apocalyptic number.

It is an amenable number.

21022201212 is an abundant number, since it is smaller than the sum of its proper divisors (28770015108).

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

21022201212 is a wasteful number, since it uses less digits than its factorization.

21022201212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75202 (or 75200 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21022201212 its reverse (21210222012), we get a palindrome (42232423224).

The spelling of 21022201212 in words is "twenty-one billion, twenty-two million, two hundred one thousand, two hundred twelve".