1242051222221 has 4 divisors (see below), whose sum is σ = 1307422339200. Its totient is φ = 1176680105244.

The previous prime is 1242051222199. The next prime is 1242051222227. The reversal of 1242051222221 is 1222221502421.

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 a de Polignac number, because none of the positive numbers 2^k-1242051222221 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242051222227) 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, 32685558461 + ... + 32685558498.

It is an arithmetic number, because the mean of its divisors is an integer number (326855584800).

Almost surely, 2^{1242051222221} is an apocalyptic number.

It is an amenable number.

1242051222221 is a deficient number, since it is larger than the sum of its proper divisors (65371116979).

1242051222221 is an equidigital number, since it uses as much as digits as its factorization.

1242051222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65371116978.

The product of its (nonzero) digits is 2560, while the sum is 26.

Adding to 1242051222221 its reverse (1222221502421), we get a palindrome (2464272724642).

The spelling of 1242051222221 in words is "one trillion, two hundred forty-two billion, fifty-one million, two hundred twenty-two thousand, two hundred twenty-one".