20021102021 has 8 divisors (see below), whose sum is σ = 20214645120. Its totient is φ = 19827678208.

The previous prime is 20021101981. The next prime is 20021102027. The reversal of 20021102021 is 12020112002.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 20021102021 - 2⁶ = 20021101957 is a prime.

It is a super-2 number, since 2×20021102021² (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 = 20021101993 and 20021102011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021102027) 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, 328100 + ... + 384306.

It is an arithmetic number, because the mean of its divisors is an integer number (2526830640).

Almost surely, 2^20021102021 is an apocalyptic number.

It is an amenable number.

20021102021 is a deficient number, since it is larger than the sum of its proper divisors (193543099).

20021102021 is a wasteful number, since it uses less digits than its factorization.

20021102021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59643.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 20021102021 its reverse (12020112002), we get a palindrome (32041214023).

The spelling of 20021102021 in words is "twenty billion, twenty-one million, one hundred two thousand, twenty-one".