20001021212 has 12 divisors (see below), whose sum is σ = 35277392640. Its totient is φ = 9921766176.

The previous prime is 20001021211. The next prime is 20001021233. The reversal of 20001021212 is 21212010002.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20001021193 and 20001021202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20001021211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19685537 + ... + 19686552.

It is an arithmetic number, because the mean of its divisors is an integer number (2939782720).

Almost surely, 2^20001021212 is an apocalyptic number.

It is an amenable number.

20001021212 is a deficient number, since it is larger than the sum of its proper divisors (15276371428).

20001021212 is a wasteful number, since it uses less digits than its factorization.

20001021212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39372220 (or 39372218 counting only the distinct ones).

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

Adding to 20001021212 its reverse (21212010002), we get a palindrome (41213031214).

The spelling of 20001021212 in words is "twenty billion, one million, twenty-one thousand, two hundred twelve".