21228481212 has 48 divisors (see below), whose sum is σ = 51727280640. Its totient is φ = 6763192128.

The previous prime is 21228481199. The next prime is 21228481237. The reversal of 21228481212 is 21218482212.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 330114 + ... + 389142.

It is an arithmetic number, because the mean of its divisors is an integer number (1077651680).

Almost surely, 2^21228481212 is an apocalyptic number.

It is an amenable number.

21228481212 is an abundant number, since it is smaller than the sum of its proper divisors (30498799428).

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

21228481212 is a wasteful number, since it uses less digits than its factorization.

21228481212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60362 (or 60360 counting only the distinct ones).

The product of its digits is 8192, while the sum is 33.

The spelling of 21228481212 in words is "twenty-one billion, two hundred twenty-eight million, four hundred eighty-one thousand, two hundred twelve".