100012222121220 has 72 divisors (see below), whose sum is σ = 314606348120064. Its totient is φ = 26669925897696.

The previous prime is 100012222121171. The next prime is 100012222121243. The reversal of 100012222121220 is 22121222210001.

It is a happy number.

100012222121220 is a `hidden beast` number, since 10 + 0 + 0 + 1 + 222 + 212 + 1 + 220 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 100012222121193 and 100012222121202.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10289318404 + ... + 10289328123.

Almost surely, 2^{100012222121220} is an apocalyptic number.

100012222121220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

100012222121220 is an abundant number, since it is smaller than the sum of its proper divisors (214594125998844).

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

100012222121220 is a wasteful number, since it uses less digits than its factorization.

100012222121220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20578646551 (or 20578646537 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 100012222121220 its reverse (22121222210001), we get a palindrome (122133444331221).

The spelling of 100012222121220 in words is "one hundred trillion, twelve billion, two hundred twenty-two million, one hundred twenty-one thousand, two hundred twenty".