211621351242 has 16 divisors (see below), whose sum is σ = 483705945792. Its totient is φ = 60463243200.

The previous prime is 211621351241. The next prime is 211621351247. The reversal of 211621351242 is 242153126112.

211621351242 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (211621351241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2519301759 + ... + 2519301842.

It is an arithmetic number, because the mean of its divisors is an integer number (30231621612).

Almost surely, 2^211621351242 is an apocalyptic number.

211621351242 is an abundant number, since it is smaller than the sum of its proper divisors (272084594550).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

211621351242 is a wasteful number, since it uses less digits than its factorization.

211621351242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5038603613.

The product of its digits is 5760, while the sum is 30.

Adding to 211621351242 its reverse (242153126112), we get a palindrome (453774477354).

The spelling of 211621351242 in words is "two hundred eleven billion, six hundred twenty-one million, three hundred fifty-one thousand, two hundred forty-two".