211142041021 has 4 divisors (see below), whose sum is σ = 213115331232. Its totient is φ = 209168750812.

The previous prime is 211142041009. The next prime is 211142041051. The reversal of 211142041021 is 120140241112.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 211142041021 - 2²¹ = 211139943869 is a prime.

It is a super-2 number, since 2×211142041021² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 211142041021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211142041001) 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, 986644945 + ... + 986645158.

It is an arithmetic number, because the mean of its divisors is an integer number (53278832808).

Almost surely, 2^211142041021 is an apocalyptic number.

It is an amenable number.

211142041021 is a deficient number, since it is larger than the sum of its proper divisors (1973290211).

211142041021 is a wasteful number, since it uses less digits than its factorization.

211142041021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1973290210.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 211142041021 its reverse (120140241112), we get a palindrome (331282282133).

The spelling of 211142041021 in words is "two hundred eleven billion, one hundred forty-two million, forty-one thousand, twenty-one".