21352525204242 has 64 divisors (see below), whose sum is σ = 44813652848640. Its totient is φ = 6769651895424.

The previous prime is 21352525204223. The next prime is 21352525204243. The reversal of 21352525204242 is 24240252525312.

It is a self number, because there is not a number n which added to its sum of digits gives 21352525204242.

It is not an unprimeable number, because it can be changed into a prime (21352525204243) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23312503 + ... + 24211109.

It is an arithmetic number, because the mean of its divisors is an integer number (700213325760).

Almost surely, 2^{21352525204242} is an apocalyptic number.

21352525204242 is an abundant number, since it is smaller than the sum of its proper divisors (23461127644398).

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

21352525204242 is a wasteful number, since it uses less digits than its factorization.

21352525204242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 899607.

The product of its (nonzero) digits is 384000, while the sum is 39.

Adding to 21352525204242 its reverse (24240252525312), we get a palindrome (45592777729554).

The spelling of 21352525204242 in words is "twenty-one trillion, three hundred fifty-two billion, five hundred twenty-five million, two hundred four thousand, two hundred forty-two".