20212202021 has 4 divisors (see below), whose sum is σ = 22049674944. Its totient is φ = 18374729100.

The previous prime is 20212202009. The next prime is 20212202041. The reversal of 20212202021 is 12020221202.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20212202021 - 2³⁴ = 3032332837 is a prime.

It is a super-2 number, since 2×20212202021² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20212201987 and 20212202005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20212202041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 918736445 + ... + 918736466.

It is an arithmetic number, because the mean of its divisors is an integer number (5512418736).

Almost surely, 2^20212202021 is an apocalyptic number.

It is an amenable number.

20212202021 is a deficient number, since it is larger than the sum of its proper divisors (1837472923).

20212202021 is a wasteful number, since it uses less digits than its factorization.

20212202021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1837472922.

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 20212202021 its reverse (12020221202), we get a palindrome (32232423223).

The spelling of 20212202021 in words is "twenty billion, two hundred twelve million, two hundred two thousand, twenty-one".