101221121987 has 8 divisors (see below), whose sum is σ = 106737812160. Its totient is φ = 95723358120.

The previous prime is 101221121959. The next prime is 101221122017. The reversal of 101221121987 is 789121122101.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 101221121987 - 2⁶ = 101221121923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (101221121087) 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, 4720589 + ... + 4741982.

It is an arithmetic number, because the mean of its divisors is an integer number (13342226520).

Almost surely, 2^101221121987 is an apocalyptic number.

101221121987 is a deficient number, since it is larger than the sum of its proper divisors (5516690173).

101221121987 is an equidigital number, since it uses as much as digits as its factorization.

101221121987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9463153.

The product of its (nonzero) digits is 4032, while the sum is 35.

The spelling of 101221121987 in words is "one hundred one billion, two hundred twenty-one million, one hundred twenty-one thousand, nine hundred eighty-seven".