1221442401 has 8 divisors (see below), whose sum is σ = 1724389344. Its totient is φ = 766395200.

The previous prime is 1221442373. The next prime is 1221442441. The reversal of 1221442401 is 1042441221.

1221442401 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 1221442401 - 2⁷ = 1221442273 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1221442441) 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, 11974875 + ... + 11974976.

It is an arithmetic number, because the mean of its divisors is an integer number (215548668).

Almost surely, 2^1221442401 is an apocalyptic number.

It is an amenable number.

1221442401 is a deficient number, since it is larger than the sum of its proper divisors (502946943).

1221442401 is a wasteful number, since it uses less digits than its factorization.

1221442401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23949871.

The product of its (nonzero) digits is 512, while the sum is 21.

The square root of 1221442401 is about 34949.1402040165. The cubic root of 1221442401 is about 1068.9506704074.

Adding to 1221442401 its reverse (1042441221), we get a palindrome (2263883622).

It can be divided in two parts, 12214 and 42401, that added together give a triangular number (54615 = T₃₃₀).

The spelling of 1221442401 in words is "one billion, two hundred twenty-one million, four hundred forty-two thousand, four hundred one".