21154535620963 has 2 divisors, whose sum is σ = 21154535620964. Its totient is φ = 21154535620962.

The previous prime is 21154535620957. The next prime is 21154535621077. The reversal of 21154535620963 is 36902653545112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21154535620963 - 2²¹ = 21154533523811 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21154535620963.

It is not a weakly prime, because it can be changed into another prime (21154535620363) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10577267810481 + 10577267810482.

It is an arithmetic number, because the mean of its divisors is an integer number (10577267810482).

Almost surely, 2^{21154535620963} is an apocalyptic number.

21154535620963 is a deficient number, since it is larger than the sum of its proper divisors (1).

21154535620963 is an equidigital number, since it uses as much as digits as its factorization.

21154535620963 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5832000, while the sum is 52.

The spelling of 21154535620963 in words is "twenty-one trillion, one hundred fifty-four billion, five hundred thirty-five million, six hundred twenty thousand, nine hundred sixty-three".