12210100661 has 4 divisors (see below), whose sum is σ = 13320109824. Its totient is φ = 11100091500.

The previous prime is 12210100601. The next prime is 12210100673. The reversal of 12210100661 is 16600101221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12210100661 - 2¹⁸ = 12209838517 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 (12210100601) 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, 555004565 + ... + 555004586.

It is an arithmetic number, because the mean of its divisors is an integer number (3330027456).

Almost surely, 2^12210100661 is an apocalyptic number.

12210100661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12210100661 is a deficient number, since it is larger than the sum of its proper divisors (1110009163).

12210100661 is a wasteful number, since it uses less digits than its factorization.

12210100661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1110009162.

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 12210100661 its reverse (16600101221), we get a palindrome (28810201882).

The spelling of 12210100661 in words is "twelve billion, two hundred ten million, one hundred thousand, six hundred sixty-one".