21465420342153 has 16 divisors (see below), whose sum is σ = 30828317577216. Its totient is φ = 13246542706320.

The previous prime is 21465420342151. The next prime is 21465420342209. The reversal of 21465420342153 is 35124302456412.

It is not a de Polignac number, because 21465420342153 - 2¹ = 21465420342151 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21465420342151) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5017627675 + ... + 5017631952.

It is an arithmetic number, because the mean of its divisors is an integer number (1926769848576).

Almost surely, 2^{21465420342153} is an apocalyptic number.

21465420342153 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21465420342153 is a deficient number, since it is larger than the sum of its proper divisors (9362897235063).

21465420342153 is a wasteful number, since it uses less digits than its factorization.

21465420342153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10035259684.

The product of its (nonzero) digits is 691200, while the sum is 42.

Adding to 21465420342153 its reverse (35124302456412), we get a palindrome (56589722798565).

The spelling of 21465420342153 in words is "twenty-one trillion, four hundred sixty-five billion, four hundred twenty million, three hundred forty-two thousand, one hundred fifty-three".