21014350666 has 8 divisors (see below), whose sum is σ = 31827560544. Its totient is φ = 10405163820.

The previous prime is 21014350661. The next prime is 21014350697. The reversal of 21014350666 is 66605341012.

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

It is a super-2 number, since 2×21014350666² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21014350661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51005500 + ... + 51005911.

It is an arithmetic number, because the mean of its divisors is an integer number (3978445068).

Almost surely, 2^21014350666 is an apocalyptic number.

21014350666 is a deficient number, since it is larger than the sum of its proper divisors (10813209878).

21014350666 is a wasteful number, since it uses less digits than its factorization.

21014350666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102011516.

The product of its (nonzero) digits is 25920, while the sum is 34.

Adding to 21014350666 its reverse (66605341012), we get a palindrome (87619691678).

The spelling of 21014350666 in words is "twenty-one billion, fourteen million, three hundred fifty thousand, six hundred sixty-six".