21011222048 has 96 divisors (see below), whose sum is σ = 44092097280. Its totient is φ = 9828000000.

The previous prime is 21011222047. The next prime is 21011222051. The reversal of 21011222048 is 84022211012.

It is a super-2 number, since 2×21011222048² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21011222047) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19991123 + ... + 19992173.

It is an arithmetic number, because the mean of its divisors is an integer number (459292680).

Almost surely, 2^21011222048 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21011222048, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22046048640).

21011222048 is an abundant number, since it is smaller than the sum of its proper divisors (23080875232).

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

21011222048 is a wasteful number, since it uses less digits than its factorization.

21011222048 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1462 (or 1454 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 23.

The spelling of 21011222048 in words is "twenty-one billion, eleven million, two hundred twenty-two thousand, forty-eight".