111220121020100 has 36 divisors (see below), whose sum is σ = 249669995813700. Its totient is φ = 42953977772160.

The previous prime is 111220121020081. The next prime is 111220121020117. The reversal of 111220121020100 is 1020121022111.

It can be written as a sum of positive squares in 6 ways, for example, as 144203986564 + 111075917033536 = 379742^2 + 10539256^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19175880035 + ... + 19175885834.

Almost surely, 2^{111220121020100} is an apocalyptic number.

111220121020100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111220121020100 is an abundant number, since it is smaller than the sum of its proper divisors (138449874793600).

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

111220121020100 is a wasteful number, since it uses less digits than its factorization.

111220121020100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38351765912 (or 38351765905 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 111220121020100 its reverse (1020121022111), we get a palindrome (112240242042211).

The spelling of 111220121020100 in words is "one hundred eleven trillion, two hundred twenty billion, one hundred twenty-one million, twenty thousand, one hundred".