1487420021 has 4 divisors (see below), whose sum is σ = 1535401344. Its totient is φ = 1439438700.

The previous prime is 1487419993. The next prime is 1487420059. The reversal of 1487420021 is 1200247841.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1487420021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1487420071) 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, 23990615 + ... + 23990676.

It is an arithmetic number, because the mean of its divisors is an integer number (383850336).

Almost surely, 2^1487420021 is an apocalyptic number.

It is an amenable number.

1487420021 is a deficient number, since it is larger than the sum of its proper divisors (47981323).

1487420021 is an equidigital number, since it uses as much as digits as its factorization.

1487420021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47981322.

The product of its (nonzero) digits is 3584, while the sum is 29.

The square root of 1487420021 is about 38567.0846837041. The cubic root of 1487420021 is about 1141.5051476569.

Adding to 1487420021 its reverse (1200247841), we get a palindrome (2687667862).

The spelling of 1487420021 in words is "one billion, four hundred eighty-seven million, four hundred twenty thousand, twenty-one".