21857152036378 has 16 divisors (see below), whose sum is σ = 33404553861120. Its totient is φ = 10722303553936.

The previous prime is 21857152036333. The next prime is 21857152036429. The reversal of 21857152036378 is 87363025175812.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17075751 + ... + 18311077.

It is an arithmetic number, because the mean of its divisors is an integer number (2087784616320).

Almost surely, 2^{21857152036378} is an apocalyptic number.

21857152036378 is a deficient number, since it is larger than the sum of its proper divisors (11547401824742).

21857152036378 is a wasteful number, since it uses less digits than its factorization.

21857152036378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1402301.

The product of its (nonzero) digits is 16934400, while the sum is 58.

The spelling of 21857152036378 in words is "twenty-one trillion, eight hundred fifty-seven billion, one hundred fifty-two million, thirty-six thousand, three hundred seventy-eight".