21203264541 has 16 divisors (see below), whose sum is σ = 29513390976. Its totient is φ = 13514873856.

The previous prime is 21203264507. The next prime is 21203264581. The reversal of 21203264541 is 14546230212.

It is not a de Polignac number, because 21203264541 - 2²¹ = 21201167389 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21203264499 and 21203264508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21203264581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 89241 + ... + 224433.

It is an arithmetic number, because the mean of its divisors is an integer number (1844586936).

Almost surely, 2^21203264541 is an apocalyptic number.

It is an amenable number.

21203264541 is a deficient number, since it is larger than the sum of its proper divisors (8310126435).

21203264541 is a wasteful number, since it uses less digits than its factorization.

21203264541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137492.

The product of its (nonzero) digits is 11520, while the sum is 30.

Adding to 21203264541 its reverse (14546230212), we get a palindrome (35749494753).

The spelling of 21203264541 in words is "twenty-one billion, two hundred three million, two hundred sixty-four thousand, five hundred forty-one".