21246667008 has 288 divisors, whose sum is σ = 68913868800. Its totient is φ = 5676023808.

The previous prime is 21246666911. The next prime is 21246667021. The reversal of 21246667008 is 80076664212.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8068060 + ... + 8070692.

Almost surely, 2^21246667008 is an apocalyptic number.

21246667008 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21246667008, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34456934400).

21246667008 is an abundant number, since it is smaller than the sum of its proper divisors (47667201792).

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

21246667008 is a wasteful number, since it uses less digits than its factorization.

21246667008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2757 (or 2743 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 42.

The spelling of 21246667008 in words is "twenty-one billion, two hundred forty-six million, six hundred sixty-seven thousand, eight".