21401515535 has 16 divisors (see below), whose sum is σ = 26080665600. Its totient is φ = 16855619616.

The previous prime is 21401515459. The next prime is 21401515547. The reversal of 21401515535 is 53551510412.

It is a cyclic number.

It is not a de Polignac number, because 21401515535 - 2¹⁴ = 21401499151 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 571106 + ... + 607424.

It is an arithmetic number, because the mean of its divisors is an integer number (1630041600).

Almost surely, 2^21401515535 is an apocalyptic number.

21401515535 is a deficient number, since it is larger than the sum of its proper divisors (4679150065).

21401515535 is a wasteful number, since it uses less digits than its factorization.

21401515535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38150.

The product of its (nonzero) digits is 15000, while the sum is 32.

The spelling of 21401515535 in words is "twenty-one billion, four hundred one million, five hundred fifteen thousand, five hundred thirty-five".