1221023031213 has 32 divisors (see below), whose sum is σ = 1726882416000. Its totient is φ = 764762187776.

The previous prime is 1221023031209. The next prime is 1221023031233. The reversal of 1221023031213 is 3121303201221.

It is a cyclic number.

It is not a de Polignac number, because 1221023031213 - 2² = 1221023031209 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1221023031213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221023031203) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 68630323 + ... + 68648111.

It is an arithmetic number, because the mean of its divisors is an integer number (53965075500).

Almost surely, 2^{1221023031213} is an apocalyptic number.

It is an amenable number.

1221023031213 is a deficient number, since it is larger than the sum of its proper divisors (505859384787).

1221023031213 is a wasteful number, since it uses less digits than its factorization.

1221023031213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20141.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 1221023031213 its reverse (3121303201221), we get a palindrome (4342326232434).

The spelling of 1221023031213 in words is "one trillion, two hundred twenty-one billion, twenty-three million, thirty-one thousand, two hundred thirteen".