21214036504436 has 12 divisors (see below), whose sum is σ = 37541693814660. Its totient is φ = 10487838271680.

The previous prime is 21214036504361. The next prime is 21214036504447. The reversal of 21214036504436 is 63440563041212.

It can be written as a sum of positive squares in 2 ways, for example, as 6466055608336 + 14747980896100 = 2542844^2 + 3840310^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21214036504393 and 21214036504402.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29794994735 + ... + 29794995446.

It is an arithmetic number, because the mean of its divisors is an integer number (3128474484555).

Almost surely, 2^{21214036504436} is an apocalyptic number.

It is an amenable number.

21214036504436 is a deficient number, since it is larger than the sum of its proper divisors (16327657310224).

21214036504436 is a wasteful number, since it uses less digits than its factorization.

21214036504436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59589990274 (or 59589990272 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 41.

Adding to 21214036504436 its reverse (63440563041212), we get a palindrome (84654599545648).

The spelling of 21214036504436 in words is "twenty-one trillion, two hundred fourteen billion, thirty-six million, five hundred four thousand, four hundred thirty-six".