20421211143 has 16 divisors (see below), whose sum is σ = 27315058400. Its totient is φ = 13570799616.

The previous prime is 20421211123. The next prime is 20421211147. The reversal of 20421211143 is 34111212402.

It is not a de Polignac number, because 20421211143 - 2¹⁶ = 20421145607 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20421211147) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2111583 + ... + 2121231.

It is an arithmetic number, because the mean of its divisors is an integer number (1707191150).

Almost surely, 2^20421211143 is an apocalyptic number.

20421211143 is a deficient number, since it is larger than the sum of its proper divisors (6893847257).

20421211143 is a wasteful number, since it uses less digits than its factorization.

20421211143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11826.

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 20421211143 its reverse (34111212402), we get a palindrome (54532423545).

The spelling of 20421211143 in words is "twenty billion, four hundred twenty-one million, two hundred eleven thousand, one hundred forty-three".