1011111222100 has 54 divisors (see below), whose sum is σ = 2552333625870. Its totient is φ = 346666703040.

The previous prime is 1011111222097. The next prime is 1011111222101. The reversal of 1011111222100 is 12221111101.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 1753431876 + 1009357790224 = 41874^2 + 1004668^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011111222101) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 103169715 + ... + 103179514.

Almost surely, 2^{1011111222100} is an apocalyptic number.

1011111222100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1011111222100 is an abundant number, since it is smaller than the sum of its proper divisors (1541222403770).

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

1011111222100 is a wasteful number, since it uses less digits than its factorization.

1011111222100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206349257 (or 206349243 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 1011111222100 its reverse (12221111101), we get a palindrome (1023332333201).

The spelling of 1011111222100 in words is "one trillion, eleven billion, one hundred eleven million, two hundred twenty-two thousand, one hundred".