21954532000 has 96 divisors (see below), whose sum is σ = 54182157120. Its totient is φ = 8742764800.

The previous prime is 21954531953. The next prime is 21954532001. The reversal of 21954532000 is 23545912.

It is not an unprimeable number, because it can be changed into a prime (21954532001) 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, 895911 + ... + 920089.

It is an arithmetic number, because the mean of its divisors is an integer number (564397470).

Almost surely, 2^21954532000 is an apocalyptic number.

21954532000 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 21954532000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27091078560).

21954532000 is an abundant number, since it is smaller than the sum of its proper divisors (32227625120).

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

21954532000 is a wasteful number, since it uses less digits than its factorization.

21954532000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24431 (or 24413 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 31.

The spelling of 21954532000 in words is "twenty-one billion, nine hundred fifty-four million, five hundred thirty-two thousand".