12010021221 has 16 divisors (see below), whose sum is σ = 17471462400. Its totient is φ = 7277825520.

The previous prime is 12010021213. The next prime is 12010021241. The reversal of 12010021221 is 12212001021.

It is not a de Polignac number, because 12010021221 - 2³ = 12010021213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12010021197 and 12010021206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12010021241) 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, 283786 + ... + 323348.

It is an arithmetic number, because the mean of its divisors is an integer number (1091966400).

Almost surely, 2^12010021221 is an apocalyptic number.

12010021221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12010021221 is a deficient number, since it is larger than the sum of its proper divisors (5461441179).

12010021221 is a wasteful number, since it uses less digits than its factorization.

12010021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48776.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 12010021221 its reverse (12212001021), we get a palindrome (24222022242).

The spelling of 12010021221 in words is "twelve billion, ten million, twenty-one thousand, two hundred twenty-one".