21440476741678 has 4 divisors (see below), whose sum is σ = 32160715112520. Its totient is φ = 10720238370838.

The previous prime is 21440476741667. The next prime is 21440476741679. The reversal of 21440476741678 is 87614767404412.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21440476741679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5360119185418 + ... + 5360119185421.

It is an arithmetic number, because the mean of its divisors is an integer number (8040178778130).

Almost surely, 2^{21440476741678} is an apocalyptic number.

21440476741678 is a deficient number, since it is larger than the sum of its proper divisors (10720238370842).

21440476741678 is a wasteful number, since it uses less digits than its factorization.

21440476741678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10720238370841.

The product of its (nonzero) digits is 50577408, while the sum is 61.

The spelling of 21440476741678 in words is "twenty-one trillion, four hundred forty billion, four hundred seventy-six million, seven hundred forty-one thousand, six hundred seventy-eight".