21432615253 has 8 divisors (see below), whose sum is σ = 24574206272. Its totient is φ = 18310971456.

The previous prime is 21432615247. The next prime is 21432615263. The reversal of 21432615253 is 35251623412.

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

It is a cyclic number.

It is not a de Polignac number, because 21432615253 - 2²¹ = 21430518101 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21432615203) 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, 4984500 + ... + 4988797.

It is an arithmetic number, because the mean of its divisors is an integer number (3071775784).

Almost surely, 2^21432615253 is an apocalyptic number.

It is an amenable number.

21432615253 is a deficient number, since it is larger than the sum of its proper divisors (3141591019).

21432615253 is an equidigital number, since it uses as much as digits as its factorization.

21432615253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9973611.

The product of its digits is 43200, while the sum is 34.

The spelling of 21432615253 in words is "twenty-one billion, four hundred thirty-two million, six hundred fifteen thousand, two hundred fifty-three".