21542614015 has 8 divisors (see below), whose sum is σ = 27839685888. Its totient is φ = 15908391840.

The previous prime is 21542614003. The next prime is 21542614031. The reversal of 21542614015 is 51041624512.

It is a happy number.

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

It is not a de Polignac number, because 21542614015 - 2¹¹ = 21542611967 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 165712351 + ... + 165712480.

It is an arithmetic number, because the mean of its divisors is an integer number (3479960736).

Almost surely, 2^21542614015 is an apocalyptic number.

21542614015 is a deficient number, since it is larger than the sum of its proper divisors (6297071873).

21542614015 is a wasteful number, since it uses less digits than its factorization.

21542614015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 331424849.

The product of its (nonzero) digits is 9600, while the sum is 31.

It can be divided in two parts, 215426 and 14015, that added together give a square (229441 = 479²).

The spelling of 21542614015 in words is "twenty-one billion, five hundred forty-two million, six hundred fourteen thousand, fifteen".