21214036536623 has 8 divisors (see below), whose sum is σ = 24384755458848. Its totient is φ = 18078353182944.

The previous prime is 21214036536617. The next prime is 21214036536677. The reversal of 21214036536623 is 32663563041212.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21214036536623 - 2⁴ = 21214036536607 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21214036533623) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8758890836 + ... + 8758893257.

It is an arithmetic number, because the mean of its divisors is an integer number (3048094432356).

Almost surely, 2^{21214036536623} is an apocalyptic number.

21214036536623 is a deficient number, since it is larger than the sum of its proper divisors (3170718922225).

21214036536623 is a wasteful number, since it uses less digits than its factorization.

21214036536623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17517784273.

The product of its (nonzero) digits is 933120, while the sum is 44.

Adding to 21214036536623 its reverse (32663563041212), we get a palindrome (53877599577835).

The spelling of 21214036536623 in words is "twenty-one trillion, two hundred fourteen billion, thirty-six million, five hundred thirty-six thousand, six hundred twenty-three".