1240201421 has 6 divisors (see below), whose sum is σ = 1308911022. Its totient is φ = 1174927320.

The previous prime is 1240201411. The next prime is 1240201429. The reversal of 1240201421 is 1241020421.

It can be written as a sum of positive squares in only one way, i.e., 1156680100 + 83521321 = 34010^2 + 9139^2 .

It is not a de Polignac number, because 1240201421 - 2¹⁸ = 1239939277 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1240201421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1240201429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1717370 + ... + 1718091.

It is an arithmetic number, because the mean of its divisors is an integer number (218151837).

Almost surely, 2^1240201421 is an apocalyptic number.

It is an amenable number.

1240201421 is a deficient number, since it is larger than the sum of its proper divisors (68709601).

1240201421 is an equidigital number, since it uses as much as digits as its factorization.

1240201421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3435499 (or 3435480 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 1240201421 is about 35216.4935932015. The cubic root of 1240201421 is about 1074.3952382824.

Adding to 1240201421 its reverse (1241020421), we get a palindrome (2481221842).

The spelling of 1240201421 in words is "one billion, two hundred forty million, two hundred one thousand, four hundred twenty-one".