21228696000 has 448 divisors, whose sum is σ = 80595216000. Its totient is φ = 5464166400.

The previous prime is 21228695989. The next prime is 21228696061. The reversal of 21228696000 is 69682212.

It is a happy number.

21228696000 is a `hidden beast` number, since 21 + 2 + 28 + 6 + 9 + 600 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 6262306 + ... + 6265694.

Almost surely, 2^21228696000 is an apocalyptic number.

21228696000 is a gapful number since it is divisible by the number (20) 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 21228696000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40297608000).

21228696000 is an abundant number, since it is smaller than the sum of its proper divisors (59366520000).

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

21228696000 is a wasteful number, since it uses less digits than its factorization.

21228696000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3454 (or 3428 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The spelling of 21228696000 in words is "twenty-one billion, two hundred twenty-eight million, six hundred ninety-six thousand".