21520501404046 has 16 divisors (see below), whose sum is σ = 34155799894800. Its totient is φ = 10141103467008.

The previous prime is 21520501403987. The next prime is 21520501404089. The reversal of 21520501404046 is 64040410502512.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1467166201 + ... + 1467180868.

It is an arithmetic number, because the mean of its divisors is an integer number (2134737493425).

Almost surely, 2^{21520501404046} is an apocalyptic number.

21520501404046 is a deficient number, since it is larger than the sum of its proper divisors (12635298490754).

21520501404046 is a wasteful number, since it uses less digits than its factorization.

21520501404046 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2934347283.

The product of its (nonzero) digits is 38400, while the sum is 34.

Adding to 21520501404046 its reverse (64040410502512), we get a palindrome (85560911906558).

The spelling of 21520501404046 in words is "twenty-one trillion, five hundred twenty billion, five hundred one million, four hundred four thousand, forty-six".