21050042340522 has 64 divisors (see below), whose sum is σ = 46810075705344. Its totient is φ = 6269206325760.

The previous prime is 21050042340421. The next prime is 21050042340553. The reversal of 21050042340522 is 22504324005012.

It is a self number, because there is not a number n which added to its sum of digits gives 21050042340522.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25508233 + ... + 26320524.

It is an arithmetic number, because the mean of its divisors is an integer number (731407432896).

Almost surely, 2^{21050042340522} is an apocalyptic number.

21050042340522 is an abundant number, since it is smaller than the sum of its proper divisors (25760033364822).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21050042340522 is a wasteful number, since it uses less digits than its factorization.

21050042340522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51828943.

The product of its (nonzero) digits is 19200, while the sum is 30.

Adding to 21050042340522 its reverse (22504324005012), we get a palindrome (43554366345534).

The spelling of 21050042340522 in words is "twenty-one trillion, fifty billion, forty-two million, three hundred forty thousand, five hundred twenty-two".