21325405242243 has 16 divisors (see below), whose sum is σ = 28480307429376. Its totient is φ = 14193723781440.

The previous prime is 21325405242203. The next prime is 21325405242259. The reversal of 21325405242243 is 34224250452312.

It is not a de Polignac number, because 21325405242243 - 2³³ = 21316815307651 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21325405242203) 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, 22028158 + ... + 22975868.

It is an arithmetic number, because the mean of its divisors is an integer number (1780019214336).

Almost surely, 2^{21325405242243} is an apocalyptic number.

21325405242243 is a deficient number, since it is larger than the sum of its proper divisors (7154902187133).

21325405242243 is a wasteful number, since it uses less digits than its factorization.

21325405242243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 959954.

The product of its (nonzero) digits is 460800, while the sum is 39.

Adding to 21325405242243 its reverse (34224250452312), we get a palindrome (55549655694555).

The spelling of 21325405242243 in words is "twenty-one trillion, three hundred twenty-five billion, four hundred five million, two hundred forty-two thousand, two hundred forty-three".