1221021211342 has 16 divisors (see below), whose sum is σ = 1911248887680. Its totient is φ = 583940616952.

The previous prime is 1221021211331. The next prime is 1221021211393. The reversal of 1221021211342 is 2431121201221.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 470913 + ... + 1632115.

It is an arithmetic number, because the mean of its divisors is an integer number (119453055480).

Almost surely, 2^{1221021211342} is an apocalyptic number.

1221021211342 is a deficient number, since it is larger than the sum of its proper divisors (690227676338).

1221021211342 is a wasteful number, since it uses less digits than its factorization.

1221021211342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1184087.

The product of its (nonzero) digits is 384, while the sum is 22.

Adding to 1221021211342 its reverse (2431121201221), we get a palindrome (3652142412563).

The spelling of 1221021211342 in words is "one trillion, two hundred twenty-one billion, twenty-one million, two hundred eleven thousand, three hundred forty-two".