1021221213213 has 4 divisors (see below), whose sum is σ = 1361628284288. Its totient is φ = 680814142140.

The previous prime is 1021221213203. The next prime is 1021221213223. The reversal of 1021221213213 is 3123121221201.

1021221213213 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (1021221213203) and next prime (1021221213223).

It is a de Polignac number, because none of the positive numbers 2^k-1021221213213 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1021221213213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021221213203) 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, 170203535533 + ... + 170203535538.

It is an arithmetic number, because the mean of its divisors is an integer number (340407071072).

Almost surely, 2^{1021221213213} is an apocalyptic number.

It is an amenable number.

1021221213213 is a deficient number, since it is larger than the sum of its proper divisors (340407071075).

1021221213213 is an equidigital number, since it uses as much as digits as its factorization.

1021221213213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340407071074.

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 1021221213213 its reverse (3123121221201), we get a palindrome (4144342434414).

The spelling of 1021221213213 in words is "one trillion, twenty-one billion, two hundred twenty-one million, two hundred thirteen thousand, two hundred thirteen".