21241361754 has 80 divisors (see below), whose sum is σ = 49306478760. Its totient is φ = 6829954560.

The previous prime is 21241361747. The next prime is 21241361797. The reversal of 21241361754 is 45716314212.

21241361754 is a `hidden beast` number, since 2 + 1 + 24 + 13 + 617 + 5 + 4 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 11767259529 + 9474102225 = 108477^2 + 97335^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 573172 + ... + 609104.

Almost surely, 2^21241361754 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21241361754, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24653239380).

21241361754 is an abundant number, since it is smaller than the sum of its proper divisors (28065117006).

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

21241361754 is a wasteful number, since it uses less digits than its factorization.

21241361754 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36077 (or 36068 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

Adding to 21241361754 its reverse (45716314212), we get a palindrome (66957675966).

The spelling of 21241361754 in words is "twenty-one billion, two hundred forty-one million, three hundred sixty-one thousand, seven hundred fifty-four".