1212210202421 has 2 divisors, whose sum is σ = 1212210202422. Its totient is φ = 1212210202420.

The previous prime is 1212210202387. The next prime is 1212210202433. The reversal of 1212210202421 is 1242020122121.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 690802011025 + 521408191396 = 831145^2 + 722086^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1212210202421 is a prime.

It is a super-2 number, since 2×1212210202421² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1212210202393 and 1212210202402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1212210202921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606105101210 + 606105101211.

It is an arithmetic number, because the mean of its divisors is an integer number (606105101211).

Almost surely, 2^{1212210202421} is an apocalyptic number.

It is an amenable number.

1212210202421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212210202421 is an equidigital number, since it uses as much as digits as its factorization.

1212210202421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 1212210202421 its reverse (1242020122121), we get a palindrome (2454230324542).

The spelling of 1212210202421 in words is "one trillion, two hundred twelve billion, two hundred ten million, two hundred two thousand, four hundred twenty-one".