1221212342132 has 12 divisors (see below), whose sum is σ = 2140424727840. Its totient is φ = 609662419896.

The previous prime is 1221212342099. The next prime is 1221212342137. The reversal of 1221212342132 is 2312432121221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221212342137) 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, 235934882 + ... + 235940057.

It is an arithmetic number, because the mean of its divisors is an integer number (178368727320).

Almost surely, 2^{1221212342132} is an apocalyptic number.

It is an amenable number.

1221212342132 is a deficient number, since it is larger than the sum of its proper divisors (919212385708).

1221212342132 is a wasteful number, since it uses less digits than its factorization.

1221212342132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 471875590 (or 471875588 counting only the distinct ones).

The product of its digits is 2304, while the sum is 26.

Adding to 1221212342132 its reverse (2312432121221), we get a palindrome (3533644463353).

The spelling of 1221212342132 in words is "one trillion, two hundred twenty-one billion, two hundred twelve million, three hundred forty-two thousand, one hundred thirty-two".