20224331721 has 64 divisors (see below), whose sum is σ = 34242048000. Its totient is φ = 11684312640.

The previous prime is 20224331719. The next prime is 20224331737. The reversal of 20224331721 is 12713342202.

20224331721 is a `hidden beast` number, since 202 + 2 + 433 + 1 + 7 + 21 = 666.

It is not a de Polignac number, because 20224331721 - 2¹ = 20224331719 is a prime.

It is a super-2 number, since 2×20224331721² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (20224331821) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 665566 + ... + 695288.

It is an arithmetic number, because the mean of its divisors is an integer number (535032000).

Almost surely, 2^20224331721 is an apocalyptic number.

It is an amenable number.

20224331721 is a deficient number, since it is larger than the sum of its proper divisors (14017716279).

20224331721 is a wasteful number, since it uses less digits than its factorization.

20224331721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29851 (or 29845 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

Adding to 20224331721 its reverse (12713342202), we get a palindrome (32937673923).

The spelling of 20224331721 in words is "twenty billion, two hundred twenty-four million, three hundred thirty-one thousand, seven hundred twenty-one".