1221542410242 has 64 divisors (see below), whose sum is σ = 3065324903424. Its totient is φ = 315262808640.

The previous prime is 1221542410211. The next prime is 1221542410261. The reversal of 1221542410242 is 2420142451221.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8347948 + ... + 8493015.

It is an arithmetic number, because the mean of its divisors is an integer number (47895701616).

Almost surely, 2^{1221542410242} is an apocalyptic number.

1221542410242 is an abundant number, since it is smaller than the sum of its proper divisors (1843782493182).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221542410242 is a wasteful number, since it uses less digits than its factorization.

1221542410242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16841143.

The product of its (nonzero) digits is 10240, while the sum is 30.

Adding to 1221542410242 its reverse (2420142451221), we get a palindrome (3641684861463).

The spelling of 1221542410242 in words is "one trillion, two hundred twenty-one billion, five hundred forty-two million, four hundred ten thousand, two hundred forty-two".