21520404446522 has 16 divisors (see below), whose sum is σ = 32909323437312. Its totient is φ = 10552070327040.

The previous prime is 21520404446501. The next prime is 21520404446539. The reversal of 21520404446522 is 22564440402512.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21520404446522.

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, 360059879 + ... + 360119642.

It is an arithmetic number, because the mean of its divisors is an integer number (2056832714832).

Almost surely, 2^{21520404446522} is an apocalyptic number.

21520404446522 is a deficient number, since it is larger than the sum of its proper divisors (11388918990790).

21520404446522 is a wasteful number, since it uses less digits than its factorization.

21520404446522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 720179813.

The product of its (nonzero) digits is 614400, while the sum is 41.

The spelling of 21520404446522 in words is "twenty-one trillion, five hundred twenty billion, four hundred four million, four hundred forty-six thousand, five hundred twenty-two".