21221708000 has 192 divisors, whose sum is σ = 55439354880. Its totient is φ = 7960896000.

The previous prime is 21221707993. The next prime is 21221708023. The reversal of 21221708000 is 80712212.

It is a congruent number.

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, 7826645 + ... + 7829355.

It is an arithmetic number, because the mean of its divisors is an integer number (288746640).

Almost surely, 2^21221708000 is an apocalyptic number.

21221708000 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 21221708000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27719677440).

21221708000 is an abundant number, since it is smaller than the sum of its proper divisors (34217646880).

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

21221708000 is a wasteful number, since it uses less digits than its factorization.

21221708000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2858 (or 2840 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 23.

The spelling of 21221708000 in words is "twenty-one billion, two hundred twenty-one million, seven hundred eight thousand".