12210401421 has 12 divisors (see below), whose sum is σ = 17640446460. Its totient is φ = 8138790720.

The previous prime is 12210401393. The next prime is 12210401459. The reversal of 12210401421 is 12410401221.

12210401421 is a `hidden beast` number, since 1 + 221 + 0 + 401 + 42 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 11111478921 + 1098922500 = 105411^2 + 33150^2 .

It is not a de Polignac number, because 12210401421 - 2¹¹ = 12210399373 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12210401394 and 12210401403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12210401221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 69486 + ... + 171023.

It is an arithmetic number, because the mean of its divisors is an integer number (1470037205).

Almost surely, 2^12210401421 is an apocalyptic number.

It is an amenable number.

12210401421 is a deficient number, since it is larger than the sum of its proper divisors (5430045039).

12210401421 is a wasteful number, since it uses less digits than its factorization.

12210401421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246156 (or 246153 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 12210401421 its reverse (12410401221), we get a palindrome (24620802642).

The spelling of 12210401421 in words is "twelve billion, two hundred ten million, four hundred one thousand, four hundred twenty-one".