1211010102221 has 4 divisors (see below), whose sum is σ = 1211159969244. Its totient is φ = 1210860235200.

The previous prime is 1211010102149. The next prime is 1211010102229. The reversal of 1211010102221 is 1222010101121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 261311126596 + 949698975625 = 511186^2 + 974525^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1211010102221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1211010102196 and 1211010102205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211010102229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74921390 + ... + 74937551.

It is an arithmetic number, because the mean of its divisors is an integer number (302789992311).

Almost surely, 2^{1211010102221} is an apocalyptic number.

It is an amenable number.

1211010102221 is a deficient number, since it is larger than the sum of its proper divisors (149867023).

1211010102221 is an equidigital number, since it uses as much as digits as its factorization.

1211010102221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149867022.

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

Adding to 1211010102221 its reverse (1222010101121), we get a palindrome (2433020203342).

The spelling of 1211010102221 in words is "one trillion, two hundred eleven billion, ten million, one hundred two thousand, two hundred twenty-one".