21486678505237 has 16 divisors (see below), whose sum is σ = 23538485736000. Its totient is φ = 19451366461440.

The previous prime is 21486678505223. The next prime is 21486678505267. The reversal of 21486678505237 is 73250587668412.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21486678505237 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21486678505267) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3101589 + ... + 7252117.

It is an arithmetic number, because the mean of its divisors is an integer number (1471155358500).

Almost surely, 2^{21486678505237} is an apocalyptic number.

It is an amenable number.

21486678505237 is a deficient number, since it is larger than the sum of its proper divisors (2051807230763).

21486678505237 is a wasteful number, since it uses less digits than its factorization.

21486678505237 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4152516.

The product of its (nonzero) digits is 135475200, while the sum is 64.

The spelling of 21486678505237 in words is "twenty-one trillion, four hundred eighty-six billion, six hundred seventy-eight million, five hundred five thousand, two hundred thirty-seven".