4251987021 has 8 divisors (see below), whose sum is σ = 5700638944. Its totient is φ = 2818996560.

The previous prime is 4251986983. The next prime is 4251987071. The reversal of 4251987021 is 1207891524.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 4251987021 - 2¹⁴ = 4251970637 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4251987071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3914731 + ... + 3915816.

It is an arithmetic number, because the mean of its divisors is an integer number (712579868).

Almost surely, 2^4251987021 is an apocalyptic number.

It is an amenable number.

4251987021 is a deficient number, since it is larger than the sum of its proper divisors (1448651923).

4251987021 is a wasteful number, since it uses less digits than its factorization.

4251987021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7830731.

The product of its (nonzero) digits is 40320, while the sum is 39.

The square root of 4251987021 is about 65207.2620265565. The cubic root of 4251987021 is about 1620.0582996090.

The spelling of 4251987021 in words is "four billion, two hundred fifty-one million, nine hundred eighty-seven thousand, twenty-one".