101221120987 has 16 divisors (see below), whose sum is σ = 118147686400. Its totient is φ = 86683372776.

The previous prime is 101221120909. The next prime is 101221121011. The reversal of 101221120987 is 789021122101.

It is a de Polignac number, because none of the positive numbers 2^k-101221120987 is a prime.

It is a super-3 number, since 3×101221120987³ (a number of 34 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (101221120387) 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, 253798 + ... + 516580.

It is an arithmetic number, because the mean of its divisors is an integer number (7384230400).

Almost surely, 2^101221120987 is an apocalyptic number.

101221120987 is a deficient number, since it is larger than the sum of its proper divisors (16926565413).

101221120987 is an equidigital number, since it uses as much as digits as its factorization.

101221120987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263927 (or 263913 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 34.

The spelling of 101221120987 in words is "one hundred one billion, two hundred twenty-one million, one hundred twenty thousand, nine hundred eighty-seven".