21101200019 has 16 divisors (see below), whose sum is σ = 21473760000. Its totient is φ = 20732643360.

The previous prime is 21101200007. The next prime is 21101200033. The reversal of 21101200019 is 91000210112.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21101200019 is a prime.

It is a super-2 number, since 2×21101200019² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21101200319) 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, 7178252 + ... + 7181190.

It is an arithmetic number, because the mean of its divisors is an integer number (1342110000).

Almost surely, 2^21101200019 is an apocalyptic number.

21101200019 is a deficient number, since it is larger than the sum of its proper divisors (372559981).

21101200019 is a wasteful number, since it uses less digits than its factorization.

21101200019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3578.

The product of its (nonzero) digits is 36, while the sum is 17.

The spelling of 21101200019 in words is "twenty-one billion, one hundred one million, two hundred thousand, nineteen".