212021101231 has 4 divisors (see below), whose sum is σ = 214925499952. Its totient is φ = 209116702512.

The previous prime is 212021101219. The next prime is 212021101363. The reversal of 212021101231 is 132101120212.

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 212021101231 - 2¹¹ = 212021099183 is a prime.

It is a super-2 number, since 2×212021101231² (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 (212021108231) 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, 1452199251 + ... + 1452199396.

It is an arithmetic number, because the mean of its divisors is an integer number (53731374988).

Almost surely, 2^212021101231 is an apocalyptic number.

212021101231 is a deficient number, since it is larger than the sum of its proper divisors (2904398721).

212021101231 is an equidigital number, since it uses as much as digits as its factorization.

212021101231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2904398720.

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

Adding to 212021101231 its reverse (132101120212), we get a palindrome (344122221443).

The spelling of 212021101231 in words is "two hundred twelve billion, twenty-one million, one hundred one thousand, two hundred thirty-one".