21535505614 has 32 divisors (see below), whose sum is σ = 37463025600. Its totient is φ = 9094187520.

The previous prime is 21535505603. The next prime is 21535505617. The reversal of 21535505614 is 41650553512.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21535505617) by changing a digit.

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, 237222 + ... + 315190.

It is an arithmetic number, because the mean of its divisors is an integer number (1170719550).

Almost surely, 2^21535505614 is an apocalyptic number.

21535505614 is a deficient number, since it is larger than the sum of its proper divisors (15927519986).

21535505614 is a wasteful number, since it uses less digits than its factorization.

21535505614 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78268.

The product of its (nonzero) digits is 90000, while the sum is 37.

The spelling of 21535505614 in words is "twenty-one billion, five hundred thirty-five million, five hundred five thousand, six hundred fourteen".