1211220100213 has 24 divisors (see below), whose sum is σ = 1355668591680. Its totient is φ = 1078258366080.

The previous prime is 1211220100117. The next prime is 1211220100231. The reversal of 1211220100213 is 3120010221121.

It is not a de Polignac number, because 1211220100213 - 2⁹ = 1211220099701 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211220100253) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3716058 + ... + 4028836.

It is an arithmetic number, because the mean of its divisors is an integer number (56486191320).

Almost surely, 2^{1211220100213} is an apocalyptic number.

It is an amenable number.

1211220100213 is a deficient number, since it is larger than the sum of its proper divisors (144448491467).

1211220100213 is a wasteful number, since it uses less digits than its factorization.

1211220100213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 313465 (or 313446 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 1211220100213 its reverse (3120010221121), we get a palindrome (4331230321334).

The spelling of 1211220100213 in words is "one trillion, two hundred eleven billion, two hundred twenty million, one hundred thousand, two hundred thirteen".