21375435727043 has 32 divisors (see below), whose sum is σ = 23836113544320. Its totient is φ = 19064738119680.

The previous prime is 21375435727007. The next prime is 21375435727099. The reversal of 21375435727043 is 34072753457312.

It is a cyclic number.

It is not a de Polignac number, because 21375435727043 - 2⁶ = 21375435726979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21375435727643) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 497811071 + ... + 497854007.

It is an arithmetic number, because the mean of its divisors is an integer number (744878548260).

Almost surely, 2^{21375435727043} is an apocalyptic number.

21375435727043 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21375435727043 is a deficient number, since it is larger than the sum of its proper divisors (2460677817277).

21375435727043 is a wasteful number, since it uses less digits than its factorization.

21375435727043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54767.

The product of its (nonzero) digits is 14817600, while the sum is 53.

The spelling of 21375435727043 in words is "twenty-one trillion, three hundred seventy-five billion, four hundred thirty-five million, seven hundred twenty-seven thousand, forty-three".