21401004043 has 2 divisors, whose sum is σ = 21401004044. Its totient is φ = 21401004042.

The previous prime is 21401004019. The next prime is 21401004059. The reversal of 21401004043 is 34040010412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21401004043 - 2¹³ = 21400995851 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21401004043.

It is not a weakly prime, because it can be changed into another prime (21401008043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10700502021 + 10700502022.

It is an arithmetic number, because the mean of its divisors is an integer number (10700502022).

Almost surely, 2^21401004043 is an apocalyptic number.

21401004043 is a deficient number, since it is larger than the sum of its proper divisors (1).

21401004043 is an equidigital number, since it uses as much as digits as its factorization.

21401004043 is an evil number, because the sum of its binary digits is even.

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

Adding to 21401004043 its reverse (34040010412), we get a palindrome (55441014455).

The spelling of 21401004043 in words is "twenty-one billion, four hundred one million, four thousand, forty-three".