100021010120028 has 36 divisors (see below), whose sum is σ = 263823533941968. Its totient is φ = 31890756849600.

The previous prime is 100021010119967. The next prime is 100021010120029. The reversal of 100021010120028 is 820021010120001.

It is a tau number, because it is divible by the number of its divisors (36).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100021010120029) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 60399159873 + ... + 60399161528.

It is an arithmetic number, because the mean of its divisors is an integer number (7328431498388).

Almost surely, 2^{100021010120028} is an apocalyptic number.

100021010120028 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

100021010120028 is an abundant number, since it is smaller than the sum of its proper divisors (163802523821940).

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

100021010120028 is a wasteful number, since it uses less digits than its factorization.

100021010120028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120798321434 (or 120798321429 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 100021010120028 its reverse (820021010120001), we get a palindrome (920042020240029).

The spelling of 100021010120028 in words is "one hundred trillion, twenty-one billion, ten million, one hundred twenty thousand, twenty-eight".