20021043212 has 24 divisors (see below), whose sum is σ = 36030523536. Its totient is φ = 9727311168.

The previous prime is 20021043209. The next prime is 20021043241. The reversal of 20021043212 is 21234012002.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26903 + ... + 201905.

It is an arithmetic number, because the mean of its divisors is an integer number (1501271814).

Almost surely, 2^20021043212 is an apocalyptic number.

It is an amenable number.

20021043212 is a deficient number, since it is larger than the sum of its proper divisors (16009480324).

20021043212 is a wasteful number, since it uses less digits than its factorization.

20021043212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175817 (or 175815 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 20021043212 its reverse (21234012002), we get a palindrome (41255055214).

The spelling of 20021043212 in words is "twenty billion, twenty-one million, forty-three thousand, two hundred twelve".