1221020210101 has 8 divisors (see below), whose sum is σ = 1235537501184. Its totient is φ = 1206579528000.

The previous prime is 1221020210089. The next prime is 1221020210159. The reversal of 1221020210101 is 1010120201221.

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 1221020210101 - 2²¹ = 1221018112949 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 (1221020210171) 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, 19120180 + ... + 19183933.

It is an arithmetic number, because the mean of its divisors is an integer number (154442187648).

Almost surely, 2^{1221020210101} is an apocalyptic number.

It is an amenable number.

1221020210101 is a deficient number, since it is larger than the sum of its proper divisors (14517291083).

1221020210101 is a wasteful number, since it uses less digits than its factorization.

1221020210101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38304491.

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

Adding to 1221020210101 its reverse (1010120201221), we get a palindrome (2231140411322).

The spelling of 1221020210101 in words is "one trillion, two hundred twenty-one billion, twenty million, two hundred ten thousand, one hundred one".