20021322143 has 8 divisors (see below), whose sum is σ = 21092647920. Its totient is φ = 18951753600.

The previous prime is 20021322107. The next prime is 20021322199. The reversal of 20021322143 is 34122312002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20021322143 is a prime.

It is a super-2 number, since 2×20021322143² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021322743) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 415880 + ... + 461517.

It is an arithmetic number, because the mean of its divisors is an integer number (2636580990).

Almost surely, 2^20021322143 is an apocalyptic number.

20021322143 is a deficient number, since it is larger than the sum of its proper divisors (1071325777).

20021322143 is a wasteful number, since it uses less digits than its factorization.

20021322143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 878617.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 20021322143 its reverse (34122312002), we get a palindrome (54143634145).

The spelling of 20021322143 in words is "twenty billion, twenty-one million, three hundred twenty-two thousand, one hundred forty-three".