21400524434231 has 16 divisors (see below), whose sum is σ = 22876185544128. Its totient is φ = 19970320761600.

The previous prime is 21400524434227. The next prime is 21400524434239. The reversal of 21400524434231 is 13243442500412.

It is a cyclic number.

It is not a de Polignac number, because 21400524434231 - 2² = 21400524434227 is a prime.

It is a super-2 number, since 2×21400524434231² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21400524434191 and 21400524434200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21400524434239) 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, 42961565 + ... + 43456841.

It is an arithmetic number, because the mean of its divisors is an integer number (1429761596508).

Almost surely, 2^{21400524434231} is an apocalyptic number.

21400524434231 is a deficient number, since it is larger than the sum of its proper divisors (1475661109897).

21400524434231 is a wasteful number, since it uses less digits than its factorization.

21400524434231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 541162.

The product of its (nonzero) digits is 92160, while the sum is 35.

Adding to 21400524434231 its reverse (13243442500412), we get a palindrome (34643966934643).

The spelling of 21400524434231 in words is "twenty-one trillion, four hundred billion, five hundred twenty-four million, four hundred thirty-four thousand, two hundred thirty-one".