100642206121 has 4 divisors (see below), whose sum is σ = 100650252672. Its totient is φ = 100634159572.

The previous prime is 100642206109. The next prime is 100642206157. The reversal of 100642206121 is 121602246001.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 121602246001 = 881 ⋅138027521.

It is a cyclic number.

It is not a de Polignac number, because 100642206121 - 2¹¹ = 100642204073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100642204121) 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, 4004485 + ... + 4029538.

It is an arithmetic number, because the mean of its divisors is an integer number (25162563168).

Almost surely, 2^100642206121 is an apocalyptic number.

It is an amenable number.

100642206121 is a deficient number, since it is larger than the sum of its proper divisors (8046551).

100642206121 is an equidigital number, since it uses as much as digits as its factorization.

100642206121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8046550.

The product of its (nonzero) digits is 1152, while the sum is 25.

The spelling of 100642206121 in words is "one hundred billion, six hundred forty-two million, two hundred six thousand, one hundred twenty-one".