1220021312135 has 8 divisors (see below), whose sum is σ = 1464114012000. Its totient is φ = 975958091424.

The previous prime is 1220021312123. The next prime is 1220021312161. The reversal of 1220021312135 is 5312131200221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1220021312135 - 2⁸ = 1220021311879 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1220021312135.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7278635 + ... + 7444364.

It is an arithmetic number, because the mean of its divisors is an integer number (183014251500).

Almost surely, 2^{1220021312135} is an apocalyptic number.

1220021312135 is a deficient number, since it is larger than the sum of its proper divisors (244092699865).

1220021312135 is a wasteful number, since it uses less digits than its factorization.

1220021312135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14739577.

The product of its (nonzero) digits is 720, while the sum is 23.

Adding to 1220021312135 its reverse (5312131200221), we get a palindrome (6532152512356).

The spelling of 1220021312135 in words is "one trillion, two hundred twenty billion, twenty-one million, three hundred twelve thousand, one hundred thirty-five".