21022719819 has 8 divisors (see below), whose sum is σ = 28292258880. Its totient is φ = 13884163656.

The previous prime is 21022719797. The next prime is 21022719833. The reversal of 21022719819 is 91891722012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21022719819 - 2⁷ = 21022719691 is a prime.

It is a super-2 number, since 2×21022719819² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21022719859) 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 7 ways as a sum of consecutive naturals, for example, 32745349 + ... + 32745990.

It is an arithmetic number, because the mean of its divisors is an integer number (3536532360).

Almost surely, 2^21022719819 is an apocalyptic number.

21022719819 is a deficient number, since it is larger than the sum of its proper divisors (7269539061).

21022719819 is a wasteful number, since it uses less digits than its factorization.

21022719819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65491449.

The product of its (nonzero) digits is 36288, while the sum is 42.

The spelling of 21022719819 in words is "twenty-one billion, twenty-two million, seven hundred nineteen thousand, eight hundred nineteen".