21511543413 has 8 divisors (see below), whose sum is σ = 28683613728. Its totient is φ = 14340251024.

The previous prime is 21511543409. The next prime is 21511543451. The reversal of 21511543413 is 31434511512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21511543413 - 2² = 21511543409 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21511543463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 126570 + ... + 242987.

It is an arithmetic number, because the mean of its divisors is an integer number (3585451716).

Almost surely, 2^21511543413 is an apocalyptic number.

It is an amenable number.

21511543413 is a deficient number, since it is larger than the sum of its proper divisors (7172070315).

21511543413 is a wasteful number, since it uses less digits than its factorization.

21511543413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 388963.

The product of its digits is 7200, while the sum is 30.

The spelling of 21511543413 in words is "twenty-one billion, five hundred eleven million, five hundred forty-three thousand, four hundred thirteen".