21123535219 has 4 divisors (see below), whose sum is σ = 21320951544. Its totient is φ = 20926118896.

The previous prime is 21123535207. The next prime is 21123535231. The reversal of 21123535219 is 91253532112.

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

It is an interprime number because it is at equal distance from previous prime (21123535207) and next prime (21123535231).

It is a cyclic number.

It is not a de Polignac number, because 21123535219 - 2¹⁵ = 21123502451 is a prime.

It is a super-2 number, since 2×21123535219² (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 (21123535259) 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, 98708002 + ... + 98708215.

It is an arithmetic number, because the mean of its divisors is an integer number (5330237886).

Almost surely, 2^21123535219 is an apocalyptic number.

21123535219 is a deficient number, since it is larger than the sum of its proper divisors (197416325).

21123535219 is a wasteful number, since it uses less digits than its factorization.

21123535219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197416324.

The product of its digits is 16200, while the sum is 34.

The spelling of 21123535219 in words is "twenty-one billion, one hundred twenty-three million, five hundred thirty-five thousand, two hundred nineteen".