212140031221 has 4 divisors (see below), whose sum is σ = 213050503692. Its totient is φ = 211229558752.

The previous prime is 212140031183. The next prime is 212140031261. The reversal of 212140031221 is 122130041212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 54519915025 + 157620116196 = 233495^2 + 397014^2 .

It is a cyclic number.

It is not a de Polignac number, because 212140031221 - 2¹⁵ = 212139998453 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 (212140031261) 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, 455235886 + ... + 455236351.

It is an arithmetic number, because the mean of its divisors is an integer number (53262625923).

Almost surely, 2^212140031221 is an apocalyptic number.

It is an amenable number.

212140031221 is a deficient number, since it is larger than the sum of its proper divisors (910472471).

212140031221 is an equidigital number, since it uses as much as digits as its factorization.

212140031221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 910472470.

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

Adding to 212140031221 its reverse (122130041212), we get a palindrome (334270072433).

Subtracting from 212140031221 its reverse (122130041212), we obtain a palindrome (90009990009).

The spelling of 212140031221 in words is "two hundred twelve billion, one hundred forty million, thirty-one thousand, two hundred twenty-one".