212021011231 has 4 divisors (see below), whose sum is σ = 212054827264. Its totient is φ = 211987195200.

The previous prime is 212021011177. The next prime is 212021011259. The reversal of 212021011231 is 132110120212.

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 212021011231 - 2¹³ = 212021003039 is a prime.

It is a super-2 number, since 2×212021011231² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212021011271) 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, 16898610 + ... + 16911151.

It is an arithmetic number, because the mean of its divisors is an integer number (53013706816).

Almost surely, 2^212021011231 is an apocalyptic number.

212021011231 is a deficient number, since it is larger than the sum of its proper divisors (33816033).

212021011231 is an equidigital number, since it uses as much as digits as its factorization.

212021011231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33816032.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 212021011231 its reverse (132110120212), we get a palindrome (344131131443).

The spelling of 212021011231 in words is "two hundred twelve billion, twenty-one million, eleven thousand, two hundred thirty-one".