21282795450 has 144 divisors (see below), whose sum is σ = 65446168320. Its totient is φ = 4857356160.

The previous prime is 21282795403. The next prime is 21282795461. The reversal of 21282795450 is 5459728212.

21282795450 is a `hidden beast` number, since 2 + 128 + 2 + 79 + 5 + 450 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a junction number, because it is equal to n+sod(n) for n = 21282795396 and 21282795405.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 2260152 + ... + 2269548.

It is an arithmetic number, because the mean of its divisors is an integer number (454487280).

Almost surely, 2^21282795450 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21282795450, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32723084160).

21282795450 is an abundant number, since it is smaller than the sum of its proper divisors (44163372870).

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

21282795450 is a wasteful number, since it uses less digits than its factorization.

21282795450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10141 (or 10133 counting only the distinct ones).

The product of its (nonzero) digits is 403200, while the sum is 45.

The spelling of 21282795450 in words is "twenty-one billion, two hundred eighty-two million, seven hundred ninety-five thousand, four hundred fifty".