21336042253 has 8 divisors (see below), whose sum is σ = 23573325888. Its totient is φ = 19207894464.

The previous prime is 21336042209. The next prime is 21336042281. The reversal of 21336042253 is 35224063312.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21336042253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21336042283) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27283551 + ... + 27284332.

It is an arithmetic number, because the mean of its divisors is an integer number (2946665736).

Almost surely, 2^21336042253 is an apocalyptic number.

21336042253 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21336042253 is a deficient number, since it is larger than the sum of its proper divisors (2237283635).

21336042253 is a wasteful number, since it uses less digits than its factorization.

21336042253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54567923.

The product of its (nonzero) digits is 25920, while the sum is 31.

The spelling of 21336042253 in words is "twenty-one billion, three hundred thirty-six million, forty-two thousand, two hundred fifty-three".