21154535046503 has 2 divisors, whose sum is σ = 21154535046504. Its totient is φ = 21154535046502.

The previous prime is 21154535046499. The next prime is 21154535046559. The reversal of 21154535046503 is 30564053545112.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21154535046503 - 2² = 21154535046499 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21154535046563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10577267523251 + 10577267523252.

It is an arithmetic number, because the mean of its divisors is an integer number (10577267523252).

Almost surely, 2^{21154535046503} is an apocalyptic number.

21154535046503 is a deficient number, since it is larger than the sum of its proper divisors (1).

21154535046503 is an equidigital number, since it uses as much as digits as its factorization.

21154535046503 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1080000, while the sum is 44.

The spelling of 21154535046503 in words is "twenty-one trillion, one hundred fifty-four billion, five hundred thirty-five million, forty-six thousand, five hundred three".