21421344230231 has 64 divisors (see below), whose sum is σ = 24875781046272. Its totient is φ = 18268934400000.

The previous prime is 21421344230189. The next prime is 21421344230233. The reversal of 21421344230231 is 13203244312412.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21421344230231 is a prime.

It is a super-2 number, since 2×21421344230231² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21421344230233) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 344413346 + ... + 344475536.

It is an arithmetic number, because the mean of its divisors is an integer number (388684078848).

Almost surely, 2^{21421344230231} is an apocalyptic number.

21421344230231 is a deficient number, since it is larger than the sum of its proper divisors (3454436816041).

21421344230231 is a wasteful number, since it uses less digits than its factorization.

21421344230231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62544.

The product of its (nonzero) digits is 27648, while the sum is 32.

Adding to 21421344230231 its reverse (13203244312412), we get a palindrome (34624588542643).

It can be divided in two parts, 214213 and 44230231, that added together give a palindrome (44444444).

The spelling of 21421344230231 in words is "twenty-one trillion, four hundred twenty-one billion, three hundred forty-four million, two hundred thirty thousand, two hundred thirty-one".