212021102231 has 4 divisors (see below), whose sum is σ = 224492931792. Its totient is φ = 199549272672.

The previous prime is 212021102219. The next prime is 212021102233. The reversal of 212021102231 is 132201120212.

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 212021102231 - 2²⁶ = 211953993367 is a prime.

It is a super-2 number, since 2×212021102231² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 12471829543 = 212021102231 / (2 + 1 + 2 + 0 + 2 + 1 + 1 + 0 + 2 + 2 + 3 + 1).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212021102233) 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, 6235914755 + ... + 6235914788.

It is an arithmetic number, because the mean of its divisors is an integer number (56123232948).

Almost surely, 2^212021102231 is an apocalyptic number.

212021102231 is a deficient number, since it is larger than the sum of its proper divisors (12471829561).

212021102231 is a wasteful number, since it uses less digits than its factorization.

212021102231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12471829560.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 212021102231 its reverse (132201120212), we get a palindrome (344222222443).

The spelling of 212021102231 in words is "two hundred twelve billion, twenty-one million, one hundred two thousand, two hundred thirty-one".