1214020421 has 2 divisors, whose sum is σ = 1214020422. Its totient is φ = 1214020420.

The previous prime is 1214020399. The next prime is 1214020427. The reversal of 1214020421 is 1240204121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1116228100 + 97792321 = 33410^2 + 9889^2 .

It is a cyclic number.

It is not a de Polignac number, because 1214020421 - 2¹⁰ = 1214019397 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1214020421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1214020427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 607010210 + 607010211.

It is an arithmetic number, because the mean of its divisors is an integer number (607010211).

Almost surely, 2^1214020421 is an apocalyptic number.

It is an amenable number.

1214020421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1214020421 is an equidigital number, since it uses as much as digits as its factorization.

1214020421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 1214020421 is about 34842.7958263972. The cubic root of 1214020421 is about 1066.7811440395.

Adding to 1214020421 its reverse (1240204121), we get a palindrome (2454224542).

The spelling of 1214020421 in words is "one billion, two hundred fourteen million, twenty thousand, four hundred twenty-one".