21227494912 has 40 divisors (see below), whose sum is σ = 45676123416. Its totient is φ = 9797302272.

The previous prime is 21227494909. The next prime is 21227494913. The reversal of 21227494912 is 21949472212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21227494913) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1587958 + ... + 1601269.

Almost surely, 2^21227494912 is an apocalyptic number.

It is an amenable number.

21227494912 is an abundant number, since it is smaller than the sum of its proper divisors (24448628504).

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

21227494912 is an equidigital number, since it uses as much as digits as its factorization.

21227494912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3189258 (or 3189242 counting only the distinct ones).

The product of its digits is 145152, while the sum is 43.

The spelling of 21227494912 in words is "twenty-one billion, two hundred twenty-seven million, four hundred ninety-four thousand, nine hundred twelve".