212121222010 has 8 divisors (see below), whose sum is σ = 381818199636. Its totient is φ = 84848488800.

The previous prime is 212121221999. The next prime is 212121222029. The reversal of 212121222010 is 10222121212.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 201709672641 + 10411549369 = 449121^2 + 102037^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10606061091 + ... + 10606061110.

Almost surely, 2^212121222010 is an apocalyptic number.

212121222010 is a deficient number, since it is larger than the sum of its proper divisors (169696977626).

212121222010 is a wasteful number, since it uses less digits than its factorization.

212121222010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21212122208.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 212121222010 its reverse (10222121212), we get a palindrome (222343343222).

The spelling of 212121222010 in words is "two hundred twelve billion, one hundred twenty-one million, two hundred twenty-two thousand, ten".