21112101987 has 8 divisors (see below), whose sum is σ = 28910265936. Its totient is φ = 13694336352.

The previous prime is 21112101953. The next prime is 21112102007. The reversal of 21112101987 is 78910121112.

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

It is not a de Polignac number, because 21112101987 - 2¹⁰ = 21112100963 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21112101917) 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, 95099448 + ... + 95099669.

It is an arithmetic number, because the mean of its divisors is an integer number (3613783242).

Almost surely, 2^21112101987 is an apocalyptic number.

21112101987 is a deficient number, since it is larger than the sum of its proper divisors (7798163949).

21112101987 is a wasteful number, since it uses less digits than its factorization.

21112101987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190199157.

The product of its (nonzero) digits is 2016, while the sum is 33.

The spelling of 21112101987 in words is "twenty-one billion, one hundred twelve million, one hundred one thousand, nine hundred eighty-seven".