21018714206 has 32 divisors (see below), whose sum is σ = 36983943360. Its totient is φ = 8770924800.

The previous prime is 21018714203. The next prime is 21018714239. The reversal of 21018714206 is 60241781012.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21018714203) 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, 256196 + ... + 328136.

It is an arithmetic number, because the mean of its divisors is an integer number (1155748230).

Almost surely, 2^21018714206 is an apocalyptic number.

21018714206 is a deficient number, since it is larger than the sum of its proper divisors (15965229154).

21018714206 is a wasteful number, since it uses less digits than its factorization.

21018714206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72500.

The product of its (nonzero) digits is 5376, while the sum is 32.

The spelling of 21018714206 in words is "twenty-one billion, eighteen million, seven hundred fourteen thousand, two hundred six".