20421200445 has 16 divisors (see below), whose sum is σ = 34595916480. Its totient is φ = 10250641664.

The previous prime is 20421200413. The next prime is 20421200453. The reversal of 20421200445 is 54400212402.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20421200445 - 2⁵ = 20421200413 is a prime.

It is a super-2 number, since 2×20421200445² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40041315 + ... + 40041824.

It is an arithmetic number, because the mean of its divisors is an integer number (2162244780).

Almost surely, 2^20421200445 is an apocalyptic number.

It is an amenable number.

20421200445 is a deficient number, since it is larger than the sum of its proper divisors (14174716035).

20421200445 is a wasteful number, since it uses less digits than its factorization.

20421200445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80083164.

The product of its (nonzero) digits is 2560, while the sum is 24.

Adding to 20421200445 its reverse (54400212402), we get a palindrome (74821412847).

The spelling of 20421200445 in words is "twenty billion, four hundred twenty-one million, two hundred thousand, four hundred forty-five".