101221100078 has 32 divisors (see below), whose sum is σ = 174635110080. Its totient is φ = 43103047680.

The previous prime is 101221100077. The next prime is 101221100083. The reversal of 101221100078 is 870001122101.

101221100078 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×101221100078² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101221100077) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1352258 + ... + 1425146.

It is an arithmetic number, because the mean of its divisors is an integer number (5457347190).

Almost surely, 2^101221100078 is an apocalyptic number.

101221100078 is a deficient number, since it is larger than the sum of its proper divisors (73414010002).

101221100078 is a wasteful number, since it uses less digits than its factorization.

101221100078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73532.

The product of its (nonzero) digits is 224, while the sum is 23.

Adding to 101221100078 its reverse (870001122101), we get a palindrome (971222222179).

The spelling of 101221100078 in words is "one hundred one billion, two hundred twenty-one million, one hundred thousand, seventy-eight".