21459049740 has 120 divisors (see below), whose sum is σ = 67832381232. Its totient is φ = 5678674560.

The previous prime is 21459049721. The next prime is 21459049747. The reversal of 21459049740 is 4794095412.

21459049740 is a `hidden beast` number, since 2 + 14 + 590 + 4 + 9 + 7 + 40 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (21459049747) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 161662 + ... + 262778.

Almost surely, 2^21459049740 is an apocalyptic number.

21459049740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21459049740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33916190616).

21459049740 is an abundant number, since it is smaller than the sum of its proper divisors (46373331492).

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

21459049740 is a wasteful number, since it uses less digits than its factorization.

21459049740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101269 (or 101258 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 45.

The spelling of 21459049740 in words is "twenty-one billion, four hundred fifty-nine million, forty-nine thousand, seven hundred forty".