21520045345004 has 6 divisors (see below), whose sum is σ = 37660079353764. Its totient is φ = 10760022672500.

The previous prime is 21520045344983. The next prime is 21520045345039. The reversal of 21520045345004 is 40054354002512.

It is a super-2 number, since 2×21520045345004² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 2690005668122 + ... + 2690005668129.

It is an arithmetic number, because the mean of its divisors is an integer number (6276679892294).

Almost surely, 2^{21520045345004} is an apocalyptic number.

It is an amenable number.

21520045345004 is a deficient number, since it is larger than the sum of its proper divisors (16140034008760).

21520045345004 is a wasteful number, since it uses less digits than its factorization.

21520045345004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5380011336255 (or 5380011336253 counting only the distinct ones).

The product of its (nonzero) digits is 96000, while the sum is 35.

Adding to 21520045345004 its reverse (40054354002512), we get a palindrome (61574399347516).

The spelling of 21520045345004 in words is "twenty-one trillion, five hundred twenty billion, forty-five million, three hundred forty-five thousand, four".