1221120020101 has 8 divisors (see below), whose sum is σ = 1283939008704. Its totient is φ = 1159111599360.

The previous prime is 1221120020077. The next prime is 1221120020137. The reversal of 1221120020101 is 1010200211221.

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

It is a cyclic number.

It is not a de Polignac number, because 1221120020101 - 2⁹ = 1221120019589 is a prime.

It is a super-2 number, since 2×1221120020101² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221120020161) 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, 202638876 + ... + 202644901.

It is an arithmetic number, because the mean of its divisors is an integer number (160492376088).

Almost surely, 2^{1221120020101} is an apocalyptic number.

It is an amenable number.

1221120020101 is a deficient number, since it is larger than the sum of its proper divisors (62818988603).

1221120020101 is a wasteful number, since it uses less digits than its factorization.

1221120020101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405283931.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 1221120020101 its reverse (1010200211221), we get a palindrome (2231320231322).

The spelling of 1221120020101 in words is "one trillion, two hundred twenty-one billion, one hundred twenty million, twenty thousand, one hundred one".