20021011221 has 8 divisors (see below), whose sum is σ = 27093109984. Its totient is φ = 13148126640.

The previous prime is 20021011103. The next prime is 20021011229. The reversal of 20021011221 is 12211012002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20021011221 - 2¹⁰ = 20021010197 is a prime.

It is a super-2 number, since 2×20021011221² (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 = 20021011197 and 20021011206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021011229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49803310 + ... + 49803711.

It is an arithmetic number, because the mean of its divisors is an integer number (3386638748).

Almost surely, 2^20021011221 is an apocalyptic number.

It is an amenable number.

20021011221 is a deficient number, since it is larger than the sum of its proper divisors (7072098763).

20021011221 is an equidigital number, since it uses as much as digits as its factorization.

20021011221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99607091.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 20021011221 its reverse (12211012002), we get a palindrome (32232023223).

The spelling of 20021011221 in words is "twenty billion, twenty-one million, eleven thousand, two hundred twenty-one".