21153435533042 has 8 divisors (see below), whose sum is σ = 32587725010476. Its totient is φ = 10290860529552.

The previous prime is 21153435533033. The next prime is 21153435533101. The reversal of 21153435533042 is 24033553435112.

It can be written as a sum of positive squares in 2 ways, for example, as 20951592898681 + 201842634361 = 4577291^2 + 449269^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 142928618393 + ... + 142928618540.

Almost surely, 2^{21153435533042} is an apocalyptic number.

21153435533042 is a deficient number, since it is larger than the sum of its proper divisors (11434289477434).

21153435533042 is a wasteful number, since it uses less digits than its factorization.

21153435533042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285857236972.

The product of its (nonzero) digits is 648000, while the sum is 41.

Adding to 21153435533042 its reverse (24033553435112), we get a palindrome (45186988968154).

The spelling of 21153435533042 in words is "twenty-one trillion, one hundred fifty-three billion, four hundred thirty-five million, five hundred thirty-three thousand, forty-two".