21106513199 has 4 divisors (see below), whose sum is σ = 21248167800. Its totient is φ = 20964858600.

The previous prime is 21106513189. The next prime is 21106513237. The reversal of 21106513199 is 99131560112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21106513199 - 2²⁴ = 21089735983 is a prime.

It is a super-2 number, since 2×21106513199² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21106513139) 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 3 ways as a sum of consecutive naturals, for example, 70827077 + ... + 70827374.

It is an arithmetic number, because the mean of its divisors is an integer number (5312041950).

Almost surely, 2^21106513199 is an apocalyptic number.

21106513199 is a deficient number, since it is larger than the sum of its proper divisors (141654601).

21106513199 is a wasteful number, since it uses less digits than its factorization.

21106513199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141654600.

The product of its (nonzero) digits is 14580, while the sum is 38.

The spelling of 21106513199 in words is "twenty-one billion, one hundred six million, five hundred thirteen thousand, one hundred ninety-nine".