2021206742 has 16 divisors (see below), whose sum is σ = 3166018272. Its totient is φ = 965933760.

The previous prime is 2021206741. The next prime is 2021206777. The reversal of 2021206742 is 2476021202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021206741) 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 7 ways as a sum of consecutive naturals, for example, 47618 + ... + 79434.

It is an arithmetic number, because the mean of its divisors is an integer number (197876142).

Almost surely, 2^2021206742 is an apocalyptic number.

2021206742 is a deficient number, since it is larger than the sum of its proper divisors (1144811530).

2021206742 is a wasteful number, since it uses less digits than its factorization.

2021206742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33223.

The product of its (nonzero) digits is 2688, while the sum is 26.

The square root of 2021206742 is about 44957.8329326492. The cubic root of 2021206742 is about 1264.3585393155.

Adding to 2021206742 its reverse (2476021202), we get a palindrome (4497227944).

The spelling of 2021206742 in words is "two billion, twenty-one million, two hundred six thousand, seven hundred forty-two".