21463203653 has 16 divisors (see below), whose sum is σ = 22400966016. Its totient is φ = 20548812480.

The previous prime is 21463203623. The next prime is 21463203661. The reversal of 21463203653 is 35630236412.

It is not a de Polignac number, because 21463203653 - 2¹² = 21463199557 is a prime.

It is a super-2 number, since 2×21463203653² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21463203623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 507851 + ... + 548487.

It is an arithmetic number, because the mean of its divisors is an integer number (1400060376).

Almost surely, 2^21463203653 is an apocalyptic number.

It is an amenable number.

21463203653 is a deficient number, since it is larger than the sum of its proper divisors (937762363).

21463203653 is a wasteful number, since it uses less digits than its factorization.

21463203653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40924.

The product of its (nonzero) digits is 77760, while the sum is 35.

The spelling of 21463203653 in words is "twenty-one billion, four hundred sixty-three million, two hundred three thousand, six hundred fifty-three".