21204232045 has 8 divisors (see below), whose sum is σ = 25534992096. Its totient is φ = 16903443216.

The previous prime is 21204232043. The next prime is 21204232099. The reversal of 21204232045 is 54023240212.

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 21204232045 - 2¹ = 21204232043 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21204232043) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7491247 + ... + 7494076.

It is an arithmetic number, because the mean of its divisors is an integer number (3191874012).

Almost surely, 2^21204232045 is an apocalyptic number.

It is an amenable number.

21204232045 is a deficient number, since it is larger than the sum of its proper divisors (4330760051).

21204232045 is a wasteful number, since it uses less digits than its factorization.

21204232045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14985611.

The product of its (nonzero) digits is 3840, while the sum is 25.

Adding to 21204232045 its reverse (54023240212), we get a palindrome (75227472257).

The spelling of 21204232045 in words is "twenty-one billion, two hundred four million, two hundred thirty-two thousand, forty-five".