21356147554043 has 2 divisors, whose sum is σ = 21356147554044. Its totient is φ = 21356147554042.

The previous prime is 21356147553991. The next prime is 21356147554081. The reversal of 21356147554043 is 34045574165312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21356147554043 - 2³² = 21351852586747 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21356147553982 and 21356147554000.

It is not a weakly prime, because it can be changed into another prime (21356147554843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10678073777021 + 10678073777022.

It is an arithmetic number, because the mean of its divisors is an integer number (10678073777022).

Almost surely, 2^{21356147554043} is an apocalyptic number.

21356147554043 is a deficient number, since it is larger than the sum of its proper divisors (1).

21356147554043 is an equidigital number, since it uses as much as digits as its factorization.

21356147554043 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048000, while the sum is 50.

The spelling of 21356147554043 in words is "twenty-one trillion, three hundred fifty-six billion, one hundred forty-seven million, five hundred fifty-four thousand, forty-three".