20143520221 has 16 divisors (see below), whose sum is σ = 22944786048. Its totient is φ = 17504942400.

The previous prime is 20143520219. The next prime is 20143520249. The reversal of 20143520221 is 12202534102.

It is a happy number.

It is not a de Polignac number, because 20143520221 - 2¹ = 20143520219 is a prime.

It is a super-2 number, since 2×20143520221² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20143520192 and 20143520201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20143520281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 385555 + ... + 434671.

It is an arithmetic number, because the mean of its divisors is an integer number (1434049128).

Almost surely, 2^20143520221 is an apocalyptic number.

It is an amenable number.

20143520221 is a deficient number, since it is larger than the sum of its proper divisors (2801265827).

20143520221 is a wasteful number, since it uses less digits than its factorization.

20143520221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50772.

The product of its (nonzero) digits is 960, while the sum is 22.

The spelling of 20143520221 in words is "twenty billion, one hundred forty-three million, five hundred twenty thousand, two hundred twenty-one".