212121310311231 has 4 divisors (see below), whose sum is σ = 282828413748312. Its totient is φ = 141414206874152.

The previous prime is 212121310311173. The next prime is 212121310311233. The reversal of 212121310311231 is 132113013121212.

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 212121310311231 - 2⁷ = 212121310311103 is a prime.

It is a super-2 number, since 2×212121310311231² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212121310311233) 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, 35353551718536 + ... + 35353551718541.

It is an arithmetic number, because the mean of its divisors is an integer number (70707103437078).

Almost surely, 2^{212121310311231} is an apocalyptic number.

212121310311231 is a deficient number, since it is larger than the sum of its proper divisors (70707103437081).

212121310311231 is an equidigital number, since it uses as much as digits as its factorization.

212121310311231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70707103437080.

The product of its (nonzero) digits is 432, while the sum is 24.

Adding to 212121310311231 its reverse (132113013121212), we get a palindrome (344234323432443).

The spelling of 212121310311231 in words is "two hundred twelve trillion, one hundred twenty-one billion, three hundred ten million, three hundred eleven thousand, two hundred thirty-one".