1211321203101 has 32 divisors (see below), whose sum is σ = 1824188403200. Its totient is φ = 794213346240.

The previous prime is 1211321203093. The next prime is 1211321203109. The reversal of 1211321203101 is 1013021231121.

1211321203101 is a `hidden beast` number, since 1 + 2 + 11 + 321 + 20 + 310 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (1211321203093) and next prime (1211321203109).

It is not a de Polignac number, because 1211321203101 - 2³ = 1211321203093 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 (1211321203109) 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, 15239580 + ... + 15318858.

It is an arithmetic number, because the mean of its divisors is an integer number (57005887600).

Almost surely, 2^{1211321203101} is an apocalyptic number.

It is an amenable number.

1211321203101 is a deficient number, since it is larger than the sum of its proper divisors (612867200099).

1211321203101 is an equidigital number, since it uses as much as digits as its factorization.

1211321203101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88626 (or 88620 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

Adding to 1211321203101 its reverse (1013021231121), we get a palindrome (2224342434222).

The spelling of 1211321203101 in words is "one trillion, two hundred eleven billion, three hundred twenty-one million, two hundred three thousand, one hundred one".