1121210001221 has 4 divisors (see below), whose sum is σ = 1132311090444. Its totient is φ = 1110108912000.

The previous prime is 1121210001181. The next prime is 1121210001271. The reversal of 1121210001221 is 1221000121211.

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 1086076622500 + 35133378721 = 1042150^2 + 187439^2 .

It is a cyclic number.

It is not a de Polignac number, because 1121210001221 - 2³⁰ = 1120136259397 is a prime.

It is a super-2 number, since 2×1121210001221² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1121210001196 and 1121210001205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1121210001271) 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, 5550544460 + ... + 5550544661.

It is an arithmetic number, because the mean of its divisors is an integer number (283077772611).

Almost surely, 2^{1121210001221} is an apocalyptic number.

It is an amenable number.

1121210001221 is a deficient number, since it is larger than the sum of its proper divisors (11101089223).

1121210001221 is a wasteful number, since it uses less digits than its factorization.

1121210001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11101089222.

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

Adding to 1121210001221 its reverse (1221000121211), we get a palindrome (2342210122432).

The spelling of 1121210001221 in words is "one trillion, one hundred twenty-one billion, two hundred ten million, one thousand, two hundred twenty-one".