21050040354342 has 64 divisors (see below), whose sum is σ = 43700273971200. Its totient is φ = 6755330492064.

The previous prime is 21050040354337. The next prime is 21050040354353. The reversal of 21050040354342 is 24345304005012.

It is a congruent number.

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, 3577723 + ... + 7409465.

It is an arithmetic number, because the mean of its divisors is an integer number (682816780800).

Almost surely, 2^{21050040354342} is an apocalyptic number.

21050040354342 is an abundant number, since it is smaller than the sum of its proper divisors (22650233616858).

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

21050040354342 is a wasteful number, since it uses less digits than its factorization.

21050040354342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3832097.

The product of its (nonzero) digits is 57600, while the sum is 33.

Adding to 21050040354342 its reverse (24345304005012), we get a palindrome (45395344359354).

The spelling of 21050040354342 in words is "twenty-one trillion, fifty billion, forty million, three hundred fifty-four thousand, three hundred forty-two".