1221001102221 has 8 divisors (see below), whose sum is σ = 1629499175424. Its totient is φ = 813251881920.

The previous prime is 1221001102169. The next prime is 1221001102259. The reversal of 1221001102221 is 1222011001221.

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

It is not a de Polignac number, because 1221001102221 - 2⁹ = 1221001101709 is a prime.

It is a super-2 number, since 2×1221001102221² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1221001102221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221001102121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 187209420 + ... + 187215941.

It is an arithmetic number, because the mean of its divisors is an integer number (203687396928).

Almost surely, 2^{1221001102221} is an apocalyptic number.

It is an amenable number.

1221001102221 is a deficient number, since it is larger than the sum of its proper divisors (408498073203).

1221001102221 is a wasteful number, since it uses less digits than its factorization.

1221001102221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 374426451.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 1221001102221 its reverse (1222011001221), we get a palindrome (2443012103442).

The spelling of 1221001102221 in words is "one trillion, two hundred twenty-one billion, one million, one hundred two thousand, two hundred twenty-one".