21464361443553 has 16 divisors (see below), whose sum is σ = 32823995546496. Its totient is φ = 12221700462720.

The previous prime is 21464361443531. The next prime is 21464361443557. The reversal of 21464361443553 is 35534416346412.

It is a happy number.

It is not a de Polignac number, because 21464361443553 - 2¹⁴ = 21464361427169 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21464361443496 and 21464361443505.

It is not an unprimeable number, because it can be changed into a prime (21464361443557) 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, 1818699526 + ... + 1818711327.

It is an arithmetic number, because the mean of its divisors is an integer number (2051499721656).

Almost surely, 2^{21464361443553} is an apocalyptic number.

It is an amenable number.

21464361443553 is a deficient number, since it is larger than the sum of its proper divisors (11359634102943).

21464361443553 is a wasteful number, since it uses less digits than its factorization.

21464361443553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3637411144.

The product of its digits is 12441600, while the sum is 51.

Adding to 21464361443553 its reverse (35534416346412), we get a palindrome (56998777789965).

The spelling of 21464361443553 in words is "twenty-one trillion, four hundred sixty-four billion, three hundred sixty-one million, four hundred forty-three thousand, five hundred fifty-three".