21214036536406 has 64 divisors (see below), whose sum is σ = 37182760058880. Its totient is φ = 8888214355200.

The previous prime is 21214036536403. The next prime is 21214036536449. The reversal of 21214036536406 is 60463563041212.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21214036536401) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3489721675 + ... + 3489727753.

It is an arithmetic number, because the mean of its divisors is an integer number (580980625920).

Almost surely, 2^{21214036536406} is an apocalyptic number.

21214036536406 is a deficient number, since it is larger than the sum of its proper divisors (15968723522474).

21214036536406 is a wasteful number, since it uses less digits than its factorization.

21214036536406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11269.

The product of its (nonzero) digits is 622080, while the sum is 43.

Adding to 21214036536406 its reverse (60463563041212), we get a palindrome (81677599577618).

The spelling of 21214036536406 in words is "twenty-one trillion, two hundred fourteen billion, thirty-six million, five hundred thirty-six thousand, four hundred six".