1221420102242 has 8 divisors (see below), whose sum is σ = 1832134895616. Its totient is φ = 610708470372.

The previous prime is 1221420102163. The next prime is 1221420102247. The reversal of 1221420102242 is 2422010241221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (1221420102247) 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, 889943 + ... + 1798565.

It is an arithmetic number, because the mean of its divisors is an integer number (229016861952).

Almost surely, 2^{1221420102242} is an apocalyptic number.

1221420102242 is a deficient number, since it is larger than the sum of its proper divisors (610714793374).

1221420102242 is an equidigital number, since it uses as much as digits as its factorization.

1221420102242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1580752.

The product of its (nonzero) digits is 1024, while the sum is 23.

Adding to 1221420102242 its reverse (2422010241221), we get a palindrome (3643430343463).

The spelling of 1221420102242 in words is "one trillion, two hundred twenty-one billion, four hundred twenty million, one hundred two thousand, two hundred forty-two".