21816447580370 has 32 divisors (see below), whose sum is σ = 40228156165680. Its totient is φ = 8513575797760.

The previous prime is 21816447580357. The next prime is 21816447580373. The reversal of 21816447580370 is 7308574461812.

It can be written as a sum of positive squares in 8 ways, for example, as 147171209641 + 21669276370729 = 383629^2 + 4655027^2 .

It is not an unprimeable number, because it can be changed into a prime (21816447580373) 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, 22674446 + ... + 23617014.

Almost surely, 2^{21816447580370} is an apocalyptic number.

21816447580370 is a deficient number, since it is larger than the sum of its proper divisors (18411708585310).

21816447580370 is a wasteful number, since it uses less digits than its factorization.

21816447580370 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 999070.

The product of its (nonzero) digits is 9031680, while the sum is 56.

The spelling of 21816447580370 in words is "twenty-one trillion, eight hundred sixteen billion, four hundred forty-seven million, five hundred eighty thousand, three hundred seventy".