21440476741638 has 16 divisors (see below), whose sum is σ = 45403362511920. Its totient is φ = 6726424075776.

The previous prime is 21440476741603. The next prime is 21440476741639. The reversal of 21440476741638 is 83614767404412.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21440476741639) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 105100376083 + ... + 105100376286.

It is an arithmetic number, because the mean of its divisors is an integer number (2837710156995).

Almost surely, 2^{21440476741638} is an apocalyptic number.

21440476741638 is an abundant number, since it is smaller than the sum of its proper divisors (23962885770282).

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

21440476741638 is a wasteful number, since it uses less digits than its factorization.

21440476741638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210200752391.

The product of its (nonzero) digits is 21676032, while the sum is 57.

The spelling of 21440476741638 in words is "twenty-one trillion, four hundred forty billion, four hundred seventy-six million, seven hundred forty-one thousand, six hundred thirty-eight".