101021212109 has 4 divisors (see below), whose sum is σ = 101058368640. Its totient is φ = 100984055580.

The previous prime is 101021212079. The next prime is 101021212129. The reversal of 101021212109 is 901212120101.

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.

It is a cyclic number.

It is not a de Polignac number, because 101021212109 - 2²⁰ = 101020163533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101021212129) 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, 18574187 + ... + 18579624.

It is an arithmetic number, because the mean of its divisors is an integer number (25264592160).

Almost surely, 2^101021212109 is an apocalyptic number.

It is an amenable number.

101021212109 is a deficient number, since it is larger than the sum of its proper divisors (37156531).

101021212109 is an equidigital number, since it uses as much as digits as its factorization.

101021212109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37156530.

The product of its (nonzero) digits is 72, while the sum is 20.

The spelling of 101021212109 in words is "one hundred one billion, twenty-one million, two hundred twelve thousand, one hundred nine".