21124052445 has 16 divisors (see below), whose sum is σ = 33803056512. Its totient is φ = 11264637120.

The previous prime is 21124052441. The next prime is 21124052447. The reversal of 21124052445 is 54425042112.

It is not a de Polignac number, because 21124052445 - 2² = 21124052441 is a prime.

It is a super-2 number, since 2×21124052445² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21124052441) 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, 24135 + ... + 206955.

It is an arithmetic number, because the mean of its divisors is an integer number (2112691032).

Almost surely, 2^21124052445 is an apocalyptic number.

It is an amenable number.

21124052445 is a deficient number, since it is larger than the sum of its proper divisors (12679004067).

21124052445 is a wasteful number, since it uses less digits than its factorization.

21124052445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190532.

The product of its (nonzero) digits is 12800, while the sum is 30.

Adding to 21124052445 its reverse (54425042112), we get a palindrome (75549094557).

The spelling of 21124052445 in words is "twenty-one billion, one hundred twenty-four million, fifty-two thousand, four hundred forty-five".