21040423111344 has 160 divisors (see below), whose sum is σ = 67814164171264. Its totient is φ = 5473107118080.

The previous prime is 21040423111307. The next prime is 21040423111361. The reversal of 21040423111344 is 44311132404012.

It is a happy number.

21040423111344 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 32673922 + ... + 33311649.

Almost surely, 2^{21040423111344} is an apocalyptic number.

21040423111344 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21040423111344 is an abundant number, since it is smaller than the sum of its proper divisors (46773741059920).

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

21040423111344 is a wasteful number, since it uses less digits than its factorization.

21040423111344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65985675 (or 65985669 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 30.

Adding to 21040423111344 its reverse (44311132404012), we get a palindrome (65351555515356).

The spelling of 21040423111344 in words is "twenty-one trillion, forty billion, four hundred twenty-three million, one hundred eleven thousand, three hundred forty-four".