2421889686 has 72 divisors (see below), whose sum is σ = 5562096120. Its totient is φ = 781138080.

The previous prime is 2421889661. The next prime is 2421889711. The reversal of 2421889686 is 6869881242.

It is an interprime number because it is at equal distance from previous prime (2421889661) and next prime (2421889711).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 13380516 + ... + 13380696.

It is an arithmetic number, because the mean of its divisors is an integer number (77251335).

Almost surely, 2^2421889686 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2421889686, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2781048060).

2421889686 is an abundant number, since it is smaller than the sum of its proper divisors (3140206434).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2421889686 is an equidigital number, since it uses as much as digits as its factorization.

2421889686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 447 (or 223 counting only the distinct ones).

The product of its digits is 2654208, while the sum is 54.

The square root of 2421889686 is about 49212.6984222568. The cubic root of 2421889686 is about 1342.9240531762.

Multiplying 2421889686 by its sum of digits (54), we get a square (130782043044 = 361638²).

2421889686 divided by its sum of digits (54) gives a square (44849809 = 6697²).

The spelling of 2421889686 in words is "two billion, four hundred twenty-one million, eight hundred eighty-nine thousand, six hundred eighty-six".