10111212220 has 12 divisors (see below), whose sum is σ = 21233545704. Its totient is φ = 4044484880.

The previous prime is 10111212211. The next prime is 10111212269. The reversal of 10111212220 is 2221211101.

It is a super-2 number, since 2×10111212220² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 10111212220.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 252780286 + ... + 252780325.

It is an arithmetic number, because the mean of its divisors is an integer number (1769462142).

Almost surely, 2^10111212220 is an apocalyptic number.

10111212220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

10111212220 is an abundant number, since it is smaller than the sum of its proper divisors (11122333484).

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

10111212220 is a wasteful number, since it uses less digits than its factorization.

10111212220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 505560620 (or 505560618 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 10111212220 its reverse (2221211101), we get a palindrome (12332423321).

The spelling of 10111212220 in words is "ten billion, one hundred eleven million, two hundred twelve thousand, two hundred twenty".