100021221078 has 16 divisors (see below), whose sum is σ = 200106616320. Its totient is φ = 33329711336.

The previous prime is 100021221077. The next prime is 100021221119. The reversal of 100021221078 is 870122120001.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100021221071) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2653650 + ... + 2691077.

It is an arithmetic number, because the mean of its divisors is an integer number (12506663520).

Almost surely, 2^100021221078 is an apocalyptic number.

100021221078 is an abundant number, since it is smaller than the sum of its proper divisors (100085395242).

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

100021221078 is a wasteful number, since it uses less digits than its factorization.

100021221078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5347851.

The product of its (nonzero) digits is 448, while the sum is 24.

Adding to 100021221078 its reverse (870122120001), we get a palindrome (970143341079).

The spelling of 100021221078 in words is "one hundred billion, twenty-one million, two hundred twenty-one thousand, seventy-eight".