21401995107 has 6 divisors (see below), whose sum is σ = 28536331332. Its totient is φ = 14267827812.

The previous prime is 21401995081. The next prime is 21401995123. The reversal of 21401995107 is 70159910412.

It is not a de Polignac number, because 21401995107 - 2¹¹ = 21401993059 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21401995177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 211158 + ... + 295620.

It is an arithmetic number, because the mean of its divisors is an integer number (4756055222).

Almost surely, 2^21401995107 is an apocalyptic number.

21401995107 is a deficient number, since it is larger than the sum of its proper divisors (7134336225).

21401995107 is an frugal number, since it uses more digits than its factorization.

21401995107 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168929 (or 84466 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 39.

The spelling of 21401995107 in words is "twenty-one billion, four hundred one million, nine hundred ninety-five thousand, one hundred seven".