1221013123132 has 48 divisors (see below), whose sum is σ = 2363380330752. Its totient is φ = 547342778880.

The previous prime is 1221013123129. The next prime is 1221013123157. The reversal of 1221013123132 is 2313213101221.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 702393 + ... + 1713295.

It is an arithmetic number, because the mean of its divisors is an integer number (49237090224).

Almost surely, 2^{1221013123132} is an apocalyptic number.

It is an amenable number.

1221013123132 is a deficient number, since it is larger than the sum of its proper divisors (1142367207620).

1221013123132 is a wasteful number, since it uses less digits than its factorization.

1221013123132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1011298 (or 1011296 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 1221013123132 its reverse (2313213101221), we get a palindrome (3534226224353).

The spelling of 1221013123132 in words is "one trillion, two hundred twenty-one billion, thirteen million, one hundred twenty-three thousand, one hundred thirty-two".