1210011001221 has 32 divisors (see below), whose sum is σ = 1807926736896. Its totient is φ = 713384712000.

The previous prime is 1210011001187. The next prime is 1210011001249. The reversal of 1210011001221 is 1221001100121.

It is not a de Polignac number, because 1210011001221 - 2²⁶ = 1209943892357 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1210011001197 and 1210011001206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1210011001321) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6540016 + ... + 6722486.

It is an arithmetic number, because the mean of its divisors is an integer number (56497710528).

Almost surely, 2^{1210011001221} is an apocalyptic number.

1210011001221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1210011001221 is a deficient number, since it is larger than the sum of its proper divisors (597915735675).

1210011001221 is a wasteful number, since it uses less digits than its factorization.

1210011001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187953.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 1210011001221 its reverse (1221001100121), we get a palindrome (2431012101342).

The spelling of 1210011001221 in words is "one trillion, two hundred ten billion, eleven million, one thousand, two hundred twenty-one".