1243021401 has 48 divisors (see below), whose sum is σ = 1951971840. Its totient is φ = 759559680.

The previous prime is 1243021391. The next prime is 1243021427. The reversal of 1243021401 is 1041203421.

1243021401 is a `hidden beast` number, since 1 + 243 + 0 + 21 + 401 = 666.

It is not a de Polignac number, because 1243021401 - 2⁵ = 1243021369 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1243021501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1410481 + ... + 1411361.

It is an arithmetic number, because the mean of its divisors is an integer number (40666080).

Almost surely, 2^1243021401 is an apocalyptic number.

It is an amenable number.

1243021401 is a deficient number, since it is larger than the sum of its proper divisors (708950439).

1243021401 is a wasteful number, since it uses less digits than its factorization.

1243021401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1166 (or 1163 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 1243021401 is about 35256.5086331588. The cubic root of 1243021401 is about 1075.2089447108.

Adding to 1243021401 its reverse (1041203421), we get a palindrome (2284224822).

The spelling of 1243021401 in words is "one billion, two hundred forty-three million, twenty-one thousand, four hundred one".