21206450592 has 144 divisors (see below), whose sum is σ = 62642885760. Its totient is φ = 7057124352.

The previous prime is 21206450543. The next prime is 21206450597. The reversal of 21206450592 is 29505460212.

21206450592 is a `hidden beast` number, since 2 + 1 + 2 + 0 + 64 + 5 + 0 + 592 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

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

It is not an unprimeable number, because it can be changed into a prime (21206450597) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5589048 + ... + 5592840.

It is an arithmetic number, because the mean of its divisors is an integer number (435020040).

Almost surely, 2^21206450592 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21206450592, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31321442880).

21206450592 is an abundant number, since it is smaller than the sum of its proper divisors (41436435168).

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

21206450592 is an equidigital number, since it uses as much as digits as its factorization.

21206450592 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4537 (or 4517 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The spelling of 21206450592 in words is "twenty-one billion, two hundred six million, four hundred fifty thousand, five hundred ninety-two".