21263005220365 has 8 divisors (see below), whose sum is σ = 25515646507008. Its totient is φ = 17010377347920.

The previous prime is 21263005220333. The next prime is 21263005220407. The reversal of 21263005220365 is 56302250036212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21263005220365 - 2⁵ = 21263005220333 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 545904 + ... + 6544006.

It is an arithmetic number, because the mean of its divisors is an integer number (3189455813376).

Almost surely, 2^{21263005220365} is an apocalyptic number.

It is an amenable number.

21263005220365 is a deficient number, since it is larger than the sum of its proper divisors (4252641286643).

21263005220365 is an equidigital number, since it uses as much as digits as its factorization.

21263005220365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6707099.

The product of its (nonzero) digits is 129600, while the sum is 37.

Adding to 21263005220365 its reverse (56302250036212), we get a palindrome (77565255256577).

The spelling of 21263005220365 in words is "twenty-one trillion, two hundred sixty-three billion, five million, two hundred twenty thousand, three hundred sixty-five".