12021660026 has 4 divisors (see below), whose sum is σ = 18032490042.
Its totient is φ = 6010830012.
The previous prime is 12021660011. The next prime is 12021660043. The reversal of 12021660026 is 62006612021.
It is a semiprime because it is the product of two primes.
It can be written as a sum of positive squares in only one way, i.e., 11098411801 + 923248225 = 105349^2 + 30385^2
It is a junction number, because it is equal to n+sod(n) for n = 12021659977 and 12021660004.
It is an unprimeable number.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3005415005 + ... + 3005415008.
Almost surely, 212021660026 is an apocalyptic number.
12021660026 is a deficient number, since it is larger than the sum of its proper divisors (6010830016).
12021660026 is an equidigital number, since it uses as much as digits as its factorization.
12021660026 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 6010830015.
The product of its (nonzero) digits is 1728, while the sum is 26.
The spelling of 12021660026 in words is "twelve billion, twenty-one million, six hundred sixty thousand, twenty-six".