1221939441 has 24 divisors (see below), whose sum is σ = 1810075176. Its totient is φ = 793877760.

The previous prime is 1221939437. The next prime is 1221939463. The reversal of 1221939441 is 1449391221.

1221939441 is a `hidden beast` number, since 1 + 22 + 193 + 9 + 441 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 39955041 + 1181984400 = 6321^2 + 34380^2 .

It is not a de Polignac number, because 1221939441 - 2² = 1221939437 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1221939396 and 1221939405.

It is not an unprimeable number, because it can be changed into a prime (1221939941) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 594171 + ... + 596223.

It is an arithmetic number, because the mean of its divisors is an integer number (75419799).

Almost surely, 2^1221939441 is an apocalyptic number.

It is an amenable number.

1221939441 is a deficient number, since it is larger than the sum of its proper divisors (588135735).

1221939441 is a wasteful number, since it uses less digits than its factorization.

1221939441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3713 (or 3710 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 1221939441 is about 34956.2503853031. The cubic root of 1221939441 is about 1069.0956463223.

The spelling of 1221939441 in words is "one billion, two hundred twenty-one million, nine hundred thirty-nine thousand, four hundred forty-one".