20221211021 has 16 divisors (see below), whose sum is σ = 22304683968. Its totient is φ = 18178905600.

The previous prime is 20221210993. The next prime is 20221211033. The reversal of 20221211021 is 12011212202.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20221211021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20221210987 and 20221211005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20221211071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1466666 + ... + 1480388.

It is an arithmetic number, because the mean of its divisors is an integer number (1394042748).

Almost surely, 2^20221211021 is an apocalyptic number.

It is an amenable number.

20221211021 is a deficient number, since it is larger than the sum of its proper divisors (2083472947).

20221211021 is a wasteful number, since it uses less digits than its factorization.

20221211021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15212.

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

Adding to 20221211021 its reverse (12011212202), we get a palindrome (32232423223).

The spelling of 20221211021 in words is "twenty billion, two hundred twenty-one million, two hundred eleven thousand, twenty-one".