20202021021 has 16 divisors (see below), whose sum is σ = 33152034944. Its totient is φ = 10656010944.

The previous prime is 20202021019. The next prime is 20202021071. The reversal of 20202021021 is 12012020202.

It is not a de Polignac number, because 20202021021 - 2¹ = 20202021019 is a prime.

20202021021 is a modest number, since divided by 21021 gives 20202 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 20202020988 and 20202021006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20202021071) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36999766 + ... + 37000311.

It is an arithmetic number, because the mean of its divisors is an integer number (2072002184).

Almost surely, 2^20202021021 is an apocalyptic number.

20202021021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20202021021 is a deficient number, since it is larger than the sum of its proper divisors (12950013923).

20202021021 is a wasteful number, since it uses less digits than its factorization.

20202021021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74000100.

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

Adding to 20202021021 its reverse (12012020202), we get a palindrome (32214041223).

The spelling of 20202021021 in words is "twenty billion, two hundred two million, twenty-one thousand, twenty-one".