21212222111010 has 48 divisors (see below), whose sum is σ = 63030602846016. Its totient is φ = 4848507910944.

The previous prime is 21212222110987. The next prime is 21212222111039. The reversal of 21212222111010 is 1011122221212.

21212222111010 is a `hidden beast` number, since 212 + 1 + 222 + 211 + 10 + 10 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16835096284 + ... + 16835097543.

It is an arithmetic number, because the mean of its divisors is an integer number (1313137559292).

Almost surely, 2^{21212222111010} is an apocalyptic number.

21212222111010 is an abundant number, since it is smaller than the sum of its proper divisors (41818380735006).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21212222111010 is a wasteful number, since it uses less digits than its factorization.

21212222111010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33670193847 (or 33670193844 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 21212222111010 its reverse (1011122221212), we get a palindrome (22223344332222).

The spelling of 21212222111010 in words is "twenty-one trillion, two hundred twelve billion, two hundred twenty-two million, one hundred eleven thousand, ten".