66102121 has 8 divisors (see below), whose sum is σ = 69678080. Its totient is φ = 62535888.

The previous prime is 66102109. The next prime is 66102131. The reversal of 66102121 is 12120166.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66102121 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66102131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14680 + ... + 18646.

It is an arithmetic number, because the mean of its divisors is an integer number (8709760).

Almost surely, 2^66102121 is an apocalyptic number.

It is an amenable number.

66102121 is a deficient number, since it is larger than the sum of its proper divisors (3575959).

66102121 is a wasteful number, since it uses less digits than its factorization.

66102121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4863.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 66102121 is about 8130.3210883704. The cubic root of 66102121 is about 404.3323267097.

Adding to 66102121 its reverse (12120166), we get a palindrome (78222287).

The spelling of 66102121 in words is "sixty-six million, one hundred two thousand, one hundred twenty-one".