1210401040221 has 6 divisors (see below), whose sum is σ = 1748357058110. Its totient is φ = 806934026808.

The previous prime is 1210401040109. The next prime is 1210401040223. The reversal of 1210401040221 is 1220401040121.

1210401040221 is a `hidden beast` number, since 1 + 2 + 1 + 0 + 401 + 0 + 40 + 221 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1093258448100 + 117142592121 = 1045590^2 + 342261^2 .

It is not a de Polignac number, because 1210401040221 - 2⁹ = 1210401039709 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1210401040194 and 1210401040203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1210401040223) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 67244502226 + ... + 67244502243.

Almost surely, 2^{1210401040221} is an apocalyptic number.

It is an amenable number.

1210401040221 is a deficient number, since it is larger than the sum of its proper divisors (537956017889).

1210401040221 is a wasteful number, since it uses less digits than its factorization.

1210401040221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134489004475 (or 134489004472 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 1210401040221 its reverse (1220401040121), we get a palindrome (2430802080342).

The spelling of 1210401040221 in words is "one trillion, two hundred ten billion, four hundred one million, forty thousand, two hundred twenty-one".