211202431021 has 16 divisors (see below), whose sum is σ = 231360470640. Its totient is φ = 191905136640.

The previous prime is 211202431001. The next prime is 211202431031. The reversal of 211202431021 is 120134202112.

It can be written as a sum of positive squares in 8 ways, for example, as 33507302500 + 177695128521 = 183050^2 + 421539^2 .

It is a cyclic number.

It is not a de Polignac number, because 211202431021 - 2¹⁷ = 211202299949 is a prime.

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 211202431021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211202431001) 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 15 ways as a sum of consecutive naturals, for example, 7843501 + ... + 7870381.

It is an arithmetic number, because the mean of its divisors is an integer number (14460029415).

Almost surely, 2^211202431021 is an apocalyptic number.

It is an amenable number.

211202431021 is a deficient number, since it is larger than the sum of its proper divisors (20158039619).

211202431021 is a wasteful number, since it uses less digits than its factorization.

211202431021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42864.

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

Adding to 211202431021 its reverse (120134202112), we get a palindrome (331336633133).

The spelling of 211202431021 in words is "two hundred eleven billion, two hundred two million, four hundred thirty-one thousand, twenty-one".