21367799378101 has 4 divisors (see below), whose sum is σ = 23310326594304. Its totient is φ = 19425272161900.

The previous prime is 21367799377997. The next prime is 21367799378141. The reversal of 21367799378101 is 10187399776312.

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 de Polignac number, because none of the positive numbers 2^k-21367799378101 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 (21367799378141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 971263608085 + ... + 971263608106.

It is an arithmetic number, because the mean of its divisors is an integer number (5827581648576).

Almost surely, 2^{21367799378101} is an apocalyptic number.

It is an amenable number.

21367799378101 is a deficient number, since it is larger than the sum of its proper divisors (1942527216203).

21367799378101 is a wasteful number, since it uses less digits than its factorization.

21367799378101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1942527216202.

The product of its (nonzero) digits is 24004512, while the sum is 64.

The spelling of 21367799378101 in words is "twenty-one trillion, three hundred sixty-seven billion, seven hundred ninety-nine million, three hundred seventy-eight thousand, one hundred one".