12210402021 has 4 divisors (see below), whose sum is σ = 16280536032. Its totient is φ = 8140268012.

The previous prime is 12210402007. The next prime is 12210402023. The reversal of 12210402021 is 12020401221.

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 12210402021 - 2¹¹ = 12210399973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12210402023) 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, 2035067001 + ... + 2035067006.

It is an arithmetic number, because the mean of its divisors is an integer number (4070134008).

Almost surely, 2^12210402021 is an apocalyptic number.

It is an amenable number.

12210402021 is a deficient number, since it is larger than the sum of its proper divisors (4070134011).

12210402021 is an equidigital number, since it uses as much as digits as its factorization.

12210402021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4070134010.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 12210402021 its reverse (12020401221), we get a palindrome (24230803242).

The spelling of 12210402021 in words is "twelve billion, two hundred ten million, four hundred two thousand, twenty-one".