20201432021 has 4 divisors (see below), whose sum is σ = 20203167852. Its totient is φ = 20199696192.

The previous prime is 20201431969. The next prime is 20201432023. The reversal of 20201432021 is 12023410202.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10575859921 + 9625572100 = 102839^2 + 98110^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20201432021 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 (20201432023) 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 3 ways as a sum of consecutive naturals, for example, 850340 + ... + 873773.

It is an arithmetic number, because the mean of its divisors is an integer number (5050791963).

Almost surely, 2^20201432021 is an apocalyptic number.

It is an amenable number.

20201432021 is a deficient number, since it is larger than the sum of its proper divisors (1735831).

20201432021 is a wasteful number, since it uses less digits than its factorization.

20201432021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1735830.

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 20201432021 its reverse (12023410202), we get a palindrome (32224842223).

The spelling of 20201432021 in words is "twenty billion, two hundred one million, four hundred thirty-two thousand, twenty-one".