1221023345502 has 32 divisors (see below), whose sum is σ = 2452156821504. Its totient is φ = 405325173600.

The previous prime is 1221023345501. The next prime is 1221023345561. The reversal of 1221023345502 is 2055433201221.

It is a self number, because there is not a number n which added to its sum of digits gives 1221023345502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221023345501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1727352 + ... + 2329332.

It is an arithmetic number, because the mean of its divisors is an integer number (76629900672).

Almost surely, 2^{1221023345502} is an apocalyptic number.

1221023345502 is an abundant number, since it is smaller than the sum of its proper divisors (1231133476002).

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

1221023345502 is a wasteful number, since it uses less digits than its factorization.

1221023345502 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 603384.

The product of its (nonzero) digits is 14400, while the sum is 30.

Adding to 1221023345502 its reverse (2055433201221), we get a palindrome (3276456546723).

The spelling of 1221023345502 in words is "one trillion, two hundred twenty-one billion, twenty-three million, three hundred forty-five thousand, five hundred two".