100427021857 has 4 divisors (see below), whose sum is σ = 102321871380. Its totient is φ = 98532172336.

The previous prime is 100427021843. The next prime is 100427021869. The reversal of 100427021857 is 758120724001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 758120724001 = 396443 ⋅1912307.

It can be written as a sum of positive squares in 2 ways, for example, as 48968821521 + 51458200336 = 221289^2 + 226844^2 .

It is a cyclic number.

It is not a de Polignac number, because 100427021857 - 2³¹ = 98279538209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100427021557) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 947424682 + ... + 947424787.

It is an arithmetic number, because the mean of its divisors is an integer number (25580467845).

Almost surely, 2^100427021857 is an apocalyptic number.

It is an amenable number.

100427021857 is a deficient number, since it is larger than the sum of its proper divisors (1894849523).

100427021857 is an equidigital number, since it uses as much as digits as its factorization.

100427021857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1894849522.

The product of its (nonzero) digits is 31360, while the sum is 37.

Adding to 100427021857 its reverse (758120724001), we get a palindrome (858547745858).

The spelling of 100427021857 in words is "one hundred billion, four hundred twenty-seven million, twenty-one thousand, eight hundred fifty-seven".