1211200431221 has 8 divisors (see below), whose sum is σ = 1322566766688. Its totient is φ = 1100043630000.

The previous prime is 1211200431211. The next prime is 1211200431269. The reversal of 1211200431221 is 1221340021121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1211200431221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1211200431193 and 1211200431202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211200431211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52371470 + ... + 52394591.

It is an arithmetic number, because the mean of its divisors is an integer number (165320845836).

Almost surely, 2^{1211200431221} is an apocalyptic number.

1211200431221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1211200431221 is a deficient number, since it is larger than the sum of its proper divisors (111366335467).

1211200431221 is a wasteful number, since it uses less digits than its factorization.

1211200431221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104767123.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 1211200431221 its reverse (1221340021121), we get a palindrome (2432540452342).

The spelling of 1211200431221 in words is "one trillion, two hundred eleven billion, two hundred million, four hundred thirty-one thousand, two hundred twenty-one".