21355435052542 has 16 divisors (see below), whose sum is σ = 32570540499312. Its totient is φ = 10498719985920.

The previous prime is 21355435052533. The next prime is 21355435052563. The reversal of 21355435052542 is 24525053455312.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21355435052492 and 21355435052501.

It is a congruent number.

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, 32616108 + ... + 33264415.

It is an arithmetic number, because the mean of its divisors is an integer number (2035658781207).

Almost surely, 2^{21355435052542} is an apocalyptic number.

21355435052542 is a deficient number, since it is larger than the sum of its proper divisors (11215105446770).

21355435052542 is a wasteful number, since it uses less digits than its factorization.

21355435052542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65883243.

The product of its (nonzero) digits is 3600000, while the sum is 46.

The spelling of 21355435052542 in words is "twenty-one trillion, three hundred fifty-five billion, four hundred thirty-five million, fifty-two thousand, five hundred forty-two".