21673219045 has 8 divisors (see below), whose sum is σ = 26014735224. Its totient is φ = 17333993664.

The previous prime is 21673218997. The next prime is 21673219103. The reversal of 21673219045 is 54091237612.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1442708289 + 20230510756 = 37983^2 + 142234^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 21673219045 - 2¹⁷ = 21673087973 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21673218989 and 21673219007.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 551814 + ... + 589783.

It is an arithmetic number, because the mean of its divisors is an integer number (3251841903).

Almost surely, 2^21673219045 is an apocalyptic number.

It is an amenable number.

21673219045 is a deficient number, since it is larger than the sum of its proper divisors (4341516179).

21673219045 is a wasteful number, since it uses less digits than its factorization.

21673219045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1145399.

The product of its (nonzero) digits is 90720, while the sum is 40.

The spelling of 21673219045 in words is "twenty-one billion, six hundred seventy-three million, two hundred nineteen thousand, forty-five".