211355143021 has 16 divisors (see below), whose sum is σ = 231310195200. Its totient is φ = 191523971520.

The previous prime is 211355142979. The next prime is 211355143033. The reversal of 211355143021 is 120341553112.

It is a cyclic number.

It is not a de Polignac number, because 211355143021 - 2¹⁷ = 211355011949 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 (211355143091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13555396 + ... + 13570978.

It is an arithmetic number, because the mean of its divisors is an integer number (14456887200).

Almost surely, 2^211355143021 is an apocalyptic number.

It is an amenable number.

211355143021 is a deficient number, since it is larger than the sum of its proper divisors (19955052179).

211355143021 is a wasteful number, since it uses less digits than its factorization.

211355143021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19476.

The product of its (nonzero) digits is 3600, while the sum is 28.

Adding to 211355143021 its reverse (120341553112), we get a palindrome (331696696133).

The spelling of 211355143021 in words is "two hundred eleven billion, three hundred fifty-five million, one hundred forty-three thousand, twenty-one".