21458347153 has 4 divisors (see below), whose sum is σ = 21752297188. Its totient is φ = 21164397120.

The previous prime is 21458347151. The next prime is 21458347159. The reversal of 21458347153 is 35174385412.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13222240144 + 8236107009 = 114988^2 + 90753^2 .

It is a cyclic number.

It is not a de Polignac number, because 21458347153 - 2¹ = 21458347151 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21458347151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 146974908 + ... + 146975053.

It is an arithmetic number, because the mean of its divisors is an integer number (5438074297).

Almost surely, 2^21458347153 is an apocalyptic number.

It is an amenable number.

21458347153 is a deficient number, since it is larger than the sum of its proper divisors (293950035).

21458347153 is an equidigital number, since it uses as much as digits as its factorization.

21458347153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 293950034.

The product of its digits is 403200, while the sum is 43.

The spelling of 21458347153 in words is "twenty-one billion, four hundred fifty-eight million, three hundred forty-seven thousand, one hundred fifty-three".