642210211 has 4 divisors (see below), whose sum is σ = 644966712. Its totient is φ = 639453712.

The previous prime is 642210193. The next prime is 642210223. The reversal of 642210211 is 112012246.

642210211 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 642210211 - 2¹³ = 642202019 is a prime.

It is a super-2 number, since 2×642210211² = 824867910225329042, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642210271) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1377901 + ... + 1378366.

It is an arithmetic number, because the mean of its divisors is an integer number (161241678).

Almost surely, 2^642210211 is an apocalyptic number.

642210211 is a deficient number, since it is larger than the sum of its proper divisors (2756501).

642210211 is a wasteful number, since it uses less digits than its factorization.

642210211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2756500.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 642210211 is about 25341.8667623362. The cubic root of 642210211 is about 862.7647685630.

Adding to 642210211 its reverse (112012246), we get a palindrome (754222457).

The spelling of 642210211 in words is "six hundred forty-two million, two hundred ten thousand, two hundred eleven".