21152402135 has 8 divisors (see below), whose sum is σ = 25416241776. Its totient is φ = 16899682240.

The previous prime is 21152402119. The next prime is 21152402179. The reversal of 21152402135 is 53120425112.

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

It is not a de Polignac number, because 21152402135 - 2⁴ = 21152402119 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2775749 + ... + 2783358.

It is an arithmetic number, because the mean of its divisors is an integer number (3177030222).

Almost surely, 2^21152402135 is an apocalyptic number.

21152402135 is a deficient number, since it is larger than the sum of its proper divisors (4263839641).

21152402135 is an equidigital number, since it uses as much as digits as its factorization.

21152402135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5559873.

The product of its (nonzero) digits is 2400, while the sum is 26.

Adding to 21152402135 its reverse (53120425112), we get a palindrome (74272827247).

The spelling of 21152402135 in words is "twenty-one billion, one hundred fifty-two million, four hundred two thousand, one hundred thirty-five".