21824281365690 has 32 divisors (see below), whose sum is σ = 52595612536896. Its totient is φ = 5795659779840.

The previous prime is 21824281365671. The next prime is 21824281365697. The reversal of 21824281365690 is 9656318242812.

It is a super-2 number, since 2×21824281365690² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21824281365690.

It is not an unprimeable number, because it can be changed into a prime (21824281365697) 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, 1509279172 + ... + 1509293631.

It is an arithmetic number, because the mean of its divisors is an integer number (1643612891778).

Almost surely, 2^{21824281365690} is an apocalyptic number.

21824281365690 is an abundant number, since it is smaller than the sum of its proper divisors (30771331171206).

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

21824281365690 is a wasteful number, since it uses less digits than its factorization.

21824281365690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3018573054.

The product of its (nonzero) digits is 9953280, while the sum is 57.

The spelling of 21824281365690 in words is "twenty-one trillion, eight hundred twenty-four billion, two hundred eighty-one million, three hundred sixty-five thousand, six hundred ninety".