21214025205524 has 12 divisors (see below), whose sum is σ = 39078467484000. Its totient is φ = 10048748781528.

The previous prime is 21214025205509. The next prime is 21214025205547. The reversal of 21214025205524 is 42550252041212.

It is a happy number.

It is a super-2 number, since 2×21214025205524² (a number of 27 digits) contains 22 as substring.

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, 139565955224 + ... + 139565955375.

It is an arithmetic number, because the mean of its divisors is an integer number (3256538957000).

Almost surely, 2^{21214025205524} is an apocalyptic number.

It is an amenable number.

21214025205524 is a deficient number, since it is larger than the sum of its proper divisors (17864442278476).

21214025205524 is a wasteful number, since it uses less digits than its factorization.

21214025205524 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279131910622 (or 279131910620 counting only the distinct ones).

The product of its (nonzero) digits is 64000, while the sum is 35.

Adding to 21214025205524 its reverse (42550252041212), we get a palindrome (63764277246736).

The spelling of 21214025205524 in words is "twenty-one trillion, two hundred fourteen billion, twenty-five million, two hundred five thousand, five hundred twenty-four".