20687006907221 has 16 divisors (see below), whose sum is σ = 20938365302400. Its totient is φ = 20437476586560.

The previous prime is 20687006907211. The next prime is 20687006907253. The reversal of 20687006907221 is 12270960078602.

It is a cyclic number.

It is not a de Polignac number, because 20687006907221 - 2¹⁰ = 20687006906197 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20687006907221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20687006907211) 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, 22713611 + ... + 23606823.

It is an arithmetic number, because the mean of its divisors is an integer number (1308647831400).

Almost surely, 2^{20687006907221} is an apocalyptic number.

It is an amenable number.

20687006907221 is a deficient number, since it is larger than the sum of its proper divisors (251358395179).

20687006907221 is a wasteful number, since it uses less digits than its factorization.

20687006907221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 894236.

The product of its (nonzero) digits is 1016064, while the sum is 50.

The spelling of 20687006907221 in words is "twenty trillion, six hundred eighty-seven billion, six million, nine hundred seven thousand, two hundred twenty-one".