21043245351323 has 16 divisors (see below), whose sum is σ = 23957071800480. Its totient is φ = 18323210859264.

The previous prime is 21043245351319. The next prime is 21043245351341. The reversal of 21043245351323 is 32315354234012.

It is a cyclic number.

It is not a de Polignac number, because 21043245351323 - 2² = 21043245351319 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21043245351343) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 182765036 + ... + 182880137.

It is an arithmetic number, because the mean of its divisors is an integer number (1497316987530).

Almost surely, 2^{21043245351323} is an apocalyptic number.

21043245351323 is a deficient number, since it is larger than the sum of its proper divisors (2913826449157).

21043245351323 is a wasteful number, since it uses less digits than its factorization.

21043245351323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 365645438.

The product of its (nonzero) digits is 259200, while the sum is 38.

Adding to 21043245351323 its reverse (32315354234012), we get a palindrome (53358599585335).

The spelling of 21043245351323 in words is "twenty-one trillion, forty-three billion, two hundred forty-five million, three hundred fifty-one thousand, three hundred twenty-three".