20211221012 has 48 divisors (see below), whose sum is σ = 36903263040. Its totient is φ = 9679411200.

The previous prime is 20211220973. The next prime is 20211221033. The reversal of 20211221012 is 21012211202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1533812 + ... + 1546932.

It is an arithmetic number, because the mean of its divisors is an integer number (768817980).

Almost surely, 2^20211221012 is an apocalyptic number.

It is an amenable number.

20211221012 is a deficient number, since it is larger than the sum of its proper divisors (16692042028).

20211221012 is a wasteful number, since it uses less digits than its factorization.

20211221012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13352 (or 13350 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 20211221012 its reverse (21012211202), we get a palindrome (41223432214).

The spelling of 20211221012 in words is "twenty billion, two hundred eleven million, two hundred twenty-one thousand, twelve".