20943214821 has 32 divisors (see below), whose sum is σ = 33740023680. Its totient is φ = 12785672448.

The previous prime is 20943214783. The next prime is 20943214883. The reversal of 20943214821 is 12841234902.

20943214821 is a `hidden beast` number, since 209 + 432 + 14 + 8 + 2 + 1 = 666.

It is not a de Polignac number, because 20943214821 - 2⁹ = 20943214309 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20943214891) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 599611 + ... + 633576.

It is an arithmetic number, because the mean of its divisors is an integer number (1054375740).

Almost surely, 2^20943214821 is an apocalyptic number.

It is an amenable number.

20943214821 is a deficient number, since it is larger than the sum of its proper divisors (12796808859).

20943214821 is a wasteful number, since it uses less digits than its factorization.

20943214821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1233250 (or 1233244 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The spelling of 20943214821 in words is "twenty billion, nine hundred forty-three million, two hundred fourteen thousand, eight hundred twenty-one".