21263165236243 has 8 divisors (see below), whose sum is σ = 24300814688000. Its totient is φ = 18225529389000.

The previous prime is 21263165236213. The next prime is 21263165236267. The reversal of 21263165236243 is 34263256136212.

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 21263165236243 - 2²⁵ = 21263131681811 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21263165236193 and 21263165236202.

It is not an unprimeable number, because it can be changed into a prime (21263165236213) 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, 202618 + ... + 6524368.

It is an arithmetic number, because the mean of its divisors is an integer number (3037601836000).

Almost surely, 2^{21263165236243} is an apocalyptic number.

21263165236243 is a deficient number, since it is larger than the sum of its proper divisors (3037649451757).

21263165236243 is an equidigital number, since it uses as much as digits as its factorization.

21263165236243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6802257.

The product of its digits is 1866240, while the sum is 46.

The spelling of 21263165236243 in words is "twenty-one trillion, two hundred sixty-three billion, one hundred sixty-five million, two hundred thirty-six thousand, two hundred forty-three".