1221001002213 has 32 divisors (see below), whose sum is σ = 1646767584000. Its totient is φ = 804654936576.

The previous prime is 1221001002211. The next prime is 1221001002223. The reversal of 1221001002213 is 3122001001221.

It is not a de Polignac number, because 1221001002213 - 2¹ = 1221001002211 is a prime.

It is a super-4 number, since 4×1221001002213⁴ (a number of 49 digits) contains 4444 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1221001002192 and 1221001002201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221001002211) 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, 304259395 + ... + 304263407.

It is an arithmetic number, because the mean of its divisors is an integer number (51461487000).

Almost surely, 2^{1221001002213} is an apocalyptic number.

It is an amenable number.

1221001002213 is a deficient number, since it is larger than the sum of its proper divisors (425766581787).

1221001002213 is a wasteful number, since it uses less digits than its factorization.

1221001002213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6061.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 1221001002213 its reverse (3122001001221), we get a palindrome (4343002003434).

The spelling of 1221001002213 in words is "one trillion, two hundred twenty-one billion, one million, two thousand, two hundred thirteen".