20021021212 has 12 divisors (see below), whose sum is σ = 35148727936. Its totient is φ = 9978527520.

The previous prime is 20021021203. The next prime is 20021021249. The reversal of 20021021212 is 21212012002.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20021021192 and 20021021201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7994364 + ... + 7996867.

Almost surely, 2^20021021212 is an apocalyptic number.

It is an amenable number.

20021021212 is a deficient number, since it is larger than the sum of its proper divisors (15127706724).

20021021212 is a wasteful number, since it uses less digits than its factorization.

20021021212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15991548 (or 15991546 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 20021021212 its reverse (21212012002), we get a palindrome (41233033214).

The spelling of 20021021212 in words is "twenty billion, twenty-one million, twenty-one thousand, two hundred twelve".