1242220222421 has 4 divisors (see below), whose sum is σ = 1256177753100. Its totient is φ = 1228262691744.

The previous prime is 1242220222403. The next prime is 1242220222483.

1242220222421 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 870089721796 + 372130500625 = 932786^2 + 610025^2 .

It is a cyclic number.

It is not a de Polignac number, because 1242220222421 - 2³⁸ = 967342315477 is a prime.

It is a super-2 number, since 2×1242220222421² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242220222121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6978765206 + ... + 6978765383.

It is an arithmetic number, because the mean of its divisors is an integer number (314044438275).

Almost surely, 2^{1242220222421} is an apocalyptic number.

It is an amenable number.

1242220222421 is a deficient number, since it is larger than the sum of its proper divisors (13957530679).

1242220222421 is an equidigital number, since it uses as much as digits as its factorization.

1242220222421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13957530678.

The product of its (nonzero) digits is 4096, while the sum is 26.

It can be divided in two parts, 1242220 and 222421, that added together give a palindrome (1464641).

The spelling of 1242220222421 in words is "one trillion, two hundred forty-two billion, two hundred twenty million, two hundred twenty-two thousand, four hundred twenty-one".