11212121111010 has 16 divisors (see below), whose sum is σ = 26909090666496. Its totient is φ = 2989898962928.

The previous prime is 11212121110921. The next prime is 11212121111017. The reversal of 11212121111010 is 1011112121211.

It is a super-2 number, since 2×11212121111010² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (11212121111017) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 186868685154 + ... + 186868685213.

It is an arithmetic number, because the mean of its divisors is an integer number (1681818166656).

Almost surely, 2^{11212121111010} is an apocalyptic number.

11212121111010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

11212121111010 is an abundant number, since it is smaller than the sum of its proper divisors (15696969555486).

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

11212121111010 is a wasteful number, since it uses less digits than its factorization.

11212121111010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 373737370377.

The product of its (nonzero) digits is 8, while the sum is 15.

Adding to 11212121111010 its reverse (1011112121211), we get a palindrome (12223233232221).

The spelling of 11212121111010 in words is "eleven trillion, two hundred twelve billion, one hundred twenty-one million, one hundred eleven thousand, ten".