1240421051 has 4 divisors (see below), whose sum is σ = 1240649592. Its totient is φ = 1240192512.

The previous prime is 1240421029. The next prime is 1240421071. The reversal of 1240421051 is 1501240421.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1240421051 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1240421071) 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 3 ways as a sum of consecutive naturals, for example, 105926 + ... + 117051.

It is an arithmetic number, because the mean of its divisors is an integer number (310162398).

Almost surely, 2^1240421051 is an apocalyptic number.

1240421051 is a deficient number, since it is larger than the sum of its proper divisors (228541).

1240421051 is an equidigital number, since it uses as much as digits as its factorization.

1240421051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228540.

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 1240421051 is about 35219.6117383483. The cubic root of 1240421051 is about 1074.4586568782.

Adding to 1240421051 its reverse (1501240421), we get a palindrome (2741661472).

The spelling of 1240421051 in words is "one billion, two hundred forty million, four hundred twenty-one thousand, fifty-one".