21601384841254 has 4 divisors (see below), whose sum is σ = 32402077261884. Its totient is φ = 10800692420626.

The previous prime is 21601384841243. The next prime is 21601384841261. The reversal of 21601384841254 is 45214848310612.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 21601384841198 and 21601384841207.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5400346210312 + ... + 5400346210315.

It is an arithmetic number, because the mean of its divisors is an integer number (8100519315471).

Almost surely, 2^{21601384841254} is an apocalyptic number.

21601384841254 is a deficient number, since it is larger than the sum of its proper divisors (10800692420630).

21601384841254 is a wasteful number, since it uses less digits than its factorization.

21601384841254 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10800692420629.

The product of its (nonzero) digits is 1474560, while the sum is 49.

The spelling of 21601384841254 in words is "twenty-one trillion, six hundred one billion, three hundred eighty-four million, eight hundred forty-one thousand, two hundred fifty-four".