1420260521 has 4 divisors (see below), whose sum is σ = 1420495044. Its totient is φ = 1420026000.

The previous prime is 1420260497. The next prime is 1420260533. The reversal of 1420260521 is 1250620241.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 340218025 + 1080042496 = 18445^2 + 32864^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1420260521 is a prime.

It is a super-2 number, since 2×1420260521² = 4034279895022382882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1420260571) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 107930 + ... + 120371.

It is an arithmetic number, because the mean of its divisors is an integer number (355123761).

Almost surely, 2^1420260521 is an apocalyptic number.

It is an amenable number.

1420260521 is a deficient number, since it is larger than the sum of its proper divisors (234523).

1420260521 is an equidigital number, since it uses as much as digits as its factorization.

1420260521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234522.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 1420260521 is about 37686.3439590523. The cubic root of 1420260521 is about 1124.0595982570.

Adding to 1420260521 its reverse (1250620241), we get a palindrome (2670880762).

The spelling of 1420260521 in words is "one billion, four hundred twenty million, two hundred sixty thousand, five hundred twenty-one".