212021310105 has 32 divisors (see below), whose sum is σ = 411192846720. Its totient is φ = 102798210240.

The previous prime is 212021310101. The next prime is 212021310133. The reversal of 212021310105 is 501013120212.

It is not a de Polignac number, because 212021310105 - 2² = 212021310101 is a prime.

It is a super-2 number, since 2×212021310105² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (212021310101) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 71386162 + ... + 71389131.

It is an arithmetic number, because the mean of its divisors is an integer number (12849776460).

Almost surely, 2^212021310105 is an apocalyptic number.

It is an amenable number.

212021310105 is a deficient number, since it is larger than the sum of its proper divisors (199171536615).

212021310105 is a wasteful number, since it uses less digits than its factorization.

212021310105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142775318 (or 142775312 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

Adding to 212021310105 its reverse (501013120212), we get a palindrome (713034430317).

The spelling of 212021310105 in words is "two hundred twelve billion, twenty-one million, three hundred ten thousand, one hundred five".