21214024236545 has 16 divisors (see below), whose sum is σ = 29093610792960. Its totient is φ = 14546713556544.

The previous prime is 21214024236529. The next prime is 21214024236547. The reversal of 21214024236545 is 54563242041212.

It is a cyclic number.

It is not a de Polignac number, because 21214024236545 - 2⁴ = 21214024236529 is a prime.

It is a super-2 number, since 2×21214024236545² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21214024236547) 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, 13268291 + ... + 14780919.

It is an arithmetic number, because the mean of its divisors is an integer number (1818350674560).

Almost surely, 2^{21214024236545} is an apocalyptic number.

It is an amenable number.

21214024236545 is a deficient number, since it is larger than the sum of its proper divisors (7879586556415).

21214024236545 is a wasteful number, since it uses less digits than its factorization.

21214024236545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1913344.

The product of its (nonzero) digits is 460800, while the sum is 41.

Adding to 21214024236545 its reverse (54563242041212), we get a palindrome (75777266277757).

The spelling of 21214024236545 in words is "twenty-one trillion, two hundred fourteen billion, twenty-four million, two hundred thirty-six thousand, five hundred forty-five".