20021202021 has 8 divisors (see below), whose sum is σ = 26696422720. Its totient is φ = 13346724672.

The previous prime is 20021201939. The next prime is 20021202059. The reversal of 20021202021 is 12020212002.

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

It is not a de Polignac number, because 20021202021 - 2¹⁵ = 20021169253 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20021201988 and 20021202006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021202221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 119620 + ... + 233133.

It is an arithmetic number, because the mean of its divisors is an integer number (3337052840).

Almost surely, 2^20021202021 is an apocalyptic number.

It is an amenable number.

20021202021 is a deficient number, since it is larger than the sum of its proper divisors (6675220699).

20021202021 is a wasteful number, since it uses less digits than its factorization.

20021202021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 371675.

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 20021202021 its reverse (12020212002), we get a palindrome (32041414023).

It can be divided in two parts, 2002 and 1202021, that multiplied together give a palindrome (2406446042).

The spelling of 20021202021 in words is "twenty billion, twenty-one million, two hundred two thousand, twenty-one".