1221210021101 has 8 divisors (see below), whose sum is σ = 1395678096384. Its totient is φ = 1046744321040.

The previous prime is 1221210021061. The next prime is 1221210021113. The reversal of 1221210021101 is 1011200121221.

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 1221210021101 - 2⁶ = 1221210021037 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 (1221210021301) 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, 694196 + ... + 1710066.

It is an arithmetic number, because the mean of its divisors is an integer number (174459762048).

Almost surely, 2^{1221210021101} is an apocalyptic number.

It is an amenable number.

1221210021101 is a deficient number, since it is larger than the sum of its proper divisors (174468075283).

1221210021101 is a wasteful number, since it uses less digits than its factorization.

1221210021101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1187611.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1221210021101 its reverse (1011200121221), we get a palindrome (2232410142322).

The spelling of 1221210021101 in words is "one trillion, two hundred twenty-one billion, two hundred ten million, twenty-one thousand, one hundred one".