21305252000 has 96 divisors (see below), whose sum is σ = 52408399680. Its totient is φ = 8512108800.

The previous prime is 21305251999. The next prime is 21305252039. The reversal of 21305252000 is 25250312.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4073387 + ... + 4078613.

It is an arithmetic number, because the mean of its divisors is an integer number (545920830).

Almost surely, 2^21305252000 is an apocalyptic number.

21305252000 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 21305252000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26204199840).

21305252000 is an abundant number, since it is smaller than the sum of its proper divisors (31103147680).

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

21305252000 is a wasteful number, since it uses less digits than its factorization.

21305252000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6271 (or 6253 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 20.

The spelling of 21305252000 in words is "twenty-one billion, three hundred five million, two hundred fifty-two thousand".