1221241404040 has 48 divisors (see below), whose sum is σ = 3196412455500. Its totient is φ = 418711337856.

The previous prime is 1221241404017. The next prime is 1221241404109. The reversal of 1221241404040 is 404041421221.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1138928646436 + 82312757604 = 1067206^2 + 286902^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1221241403996 and 1221241404014.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 311539215 + ... + 311543134.

Almost surely, 2^{1221241404040} is an apocalyptic number.

1221241404040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221241404040 is an abundant number, since it is smaller than the sum of its proper divisors (1975171051460).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221241404040 is a wasteful number, since it uses less digits than its factorization.

1221241404040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 623082374 (or 623082363 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 25.

Adding to 1221241404040 its reverse (404041421221), we get a palindrome (1625282825261).

The spelling of 1221241404040 in words is "one trillion, two hundred twenty-one billion, two hundred forty-one million, four hundred four thousand, forty".