21140400043 has 8 divisors (see below), whose sum is σ = 24161746400. Its totient is φ = 18119376000.

The previous prime is 21140400037. The next prime is 21140400097. The reversal of 21140400043 is 34000404112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21140400043 - 2⁵ = 21140400011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21140400943) 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, 81793 + ... + 221293.

It is an arithmetic number, because the mean of its divisors is an integer number (3020218300).

Almost surely, 2^21140400043 is an apocalyptic number.

21140400043 is a deficient number, since it is larger than the sum of its proper divisors (3021346357).

21140400043 is a wasteful number, since it uses less digits than its factorization.

21140400043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161157.

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 21140400043 its reverse (34000404112), we get a palindrome (55140804155).

The spelling of 21140400043 in words is "twenty-one billion, one hundred forty million, four hundred thousand, forty-three".