1221010212101 has 16 divisors (see below), whose sum is σ = 1264839141888. Its totient is φ = 1177932672000.

The previous prime is 1221010212083. The next prime is 1221010212127. The reversal of 1221010212101 is 1012120101221.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221010212101 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221010212131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15554651 + ... + 15632951.

It is an arithmetic number, because the mean of its divisors is an integer number (79052446368).

Almost surely, 2^{1221010212101} is an apocalyptic number.

It is an amenable number.

1221010212101 is a deficient number, since it is larger than the sum of its proper divisors (43828929787).

1221010212101 is an equidigital number, since it uses as much as digits as its factorization.

1221010212101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83092.

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

Adding to 1221010212101 its reverse (1012120101221), we get a palindrome (2233130313322).

The spelling of 1221010212101 in words is "one trillion, two hundred twenty-one billion, ten million, two hundred twelve thousand, one hundred one".