20331221453 has 16 divisors (see below), whose sum is σ = 21507839040. Its totient is φ = 19218744720.

The previous prime is 20331221423. The next prime is 20331221479. The reversal of 20331221453 is 35412213302.

It is a happy number.

It is not a de Polignac number, because 20331221453 - 2¹⁸ = 20330959309 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20331221423) 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, 3364751 + ... + 3370787.

It is an arithmetic number, because the mean of its divisors is an integer number (1344239940).

Almost surely, 2^20331221453 is an apocalyptic number.

It is an amenable number.

20331221453 is a deficient number, since it is larger than the sum of its proper divisors (1176617587).

20331221453 is an frugal number, since it uses more digits than its factorization.

20331221453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6585 (or 6547 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 26.

Adding to 20331221453 its reverse (35412213302), we get a palindrome (55743434755).

The spelling of 20331221453 in words is "twenty billion, three hundred thirty-one million, two hundred twenty-one thousand, four hundred fifty-three".