1211403004221 has 16 divisors (see below), whose sum is σ = 1645919170560. Its totient is φ = 792248857920.

The previous prime is 1211403004211. The next prime is 1211403004241. The reversal of 1211403004221 is 1224003041121.

It is not a de Polignac number, because 1211403004221 - 2¹⁹ = 1211402479933 is a prime.

It is a super-3 number, since 3×1211403004221³ (a number of 37 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211403004211) 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, 547635 + ... + 1650063.

It is an arithmetic number, because the mean of its divisors is an integer number (102869948160).

Almost surely, 2^{1211403004221} is an apocalyptic number.

It is an amenable number.

1211403004221 is a deficient number, since it is larger than the sum of its proper divisors (434516166339).

1211403004221 is a wasteful number, since it uses less digits than its factorization.

1211403004221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1109396.

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 1211403004221 its reverse (1224003041121), we get a palindrome (2435406045342).

The spelling of 1211403004221 in words is "one trillion, two hundred eleven billion, four hundred three million, four thousand, two hundred twenty-one".