20522213321 has 4 divisors (see below), whose sum is σ = 20526785412. Its totient is φ = 20517641232.

The previous prime is 20522213317. The next prime is 20522213407. The reversal of 20522213321 is 12331222502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12331222502 = 2 ⋅6165611251.

It can be written as a sum of positive squares in 2 ways, for example, as 19771453321 + 750760000 = 140611^2 + 27400^2 .

It is a cyclic number.

It is not a de Polignac number, because 20522213321 - 2² = 20522213317 is a prime.

It is a super-2 number, since 2×20522213321² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20522213821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2279306 + ... + 2288291.

It is an arithmetic number, because the mean of its divisors is an integer number (5131696353).

Almost surely, 2^20522213321 is an apocalyptic number.

It is an amenable number.

20522213321 is a deficient number, since it is larger than the sum of its proper divisors (4572091).

20522213321 is an equidigital number, since it uses as much as digits as its factorization.

20522213321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4572090.

The product of its (nonzero) digits is 1440, while the sum is 23.

Adding to 20522213321 its reverse (12331222502), we get a palindrome (32853435823).

The spelling of 20522213321 in words is "twenty billion, five hundred twenty-two million, two hundred thirteen thousand, three hundred twenty-one".