1451340021 has 16 divisors (see below), whose sum is σ = 1955583360. Its totient is φ = 957358080.

The previous prime is 1451340019. The next prime is 1451340041. The reversal of 1451340021 is 1200431541.

It is not a de Polignac number, because 1451340021 - 2¹ = 1451340019 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1451340021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1451340001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 213960 + ... + 220638.

It is an arithmetic number, because the mean of its divisors is an integer number (122223960).

Almost surely, 2^1451340021 is an apocalyptic number.

It is an amenable number.

1451340021 is a deficient number, since it is larger than the sum of its proper divisors (504243339).

1451340021 is a wasteful number, since it uses less digits than its factorization.

1451340021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7436.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 1451340021 is about 38096.4568037501. The cubic root of 1451340021 is about 1132.1997562823.

Adding to 1451340021 its reverse (1200431541), we get a palindrome (2651771562).

The spelling of 1451340021 in words is "one billion, four hundred fifty-one million, three hundred forty thousand, twenty-one".