2421909021 has 8 divisors (see below), whose sum is σ = 3690528064. Its totient is φ = 1383948000.

The previous prime is 2421908971. The next prime is 2421909023. The reversal of 2421909021 is 1209091242.

It is a happy number.

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

It is not a de Polignac number, because 2421909021 - 2⁹ = 2421908509 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2421909021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2421909023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57664480 + ... + 57664521.

It is an arithmetic number, because the mean of its divisors is an integer number (461316008).

Almost surely, 2^2421909021 is an apocalyptic number.

2421909021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2421909021 is a deficient number, since it is larger than the sum of its proper divisors (1268619043).

2421909021 is a wasteful number, since it uses less digits than its factorization.

2421909021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115329011.

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 2421909021 is about 49212.8948650656. The cubic root of 2421909021 is about 1342.9276268825.

The spelling of 2421909021 in words is "two billion, four hundred twenty-one million, nine hundred nine thousand, twenty-one".