21541442410 has 8 divisors (see below), whose sum is σ = 38774596356. Its totient is φ = 8616576960.

The previous prime is 21541442399. The next prime is 21541442423. The reversal of 21541442410 is 1424414512.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 18601959321 + 2939483089 = 136389^2 + 54217^2 .

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

It is a super-2 number, since 2×21541442410² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1077072111 + ... + 1077072130.

Almost surely, 2^21541442410 is an apocalyptic number.

21541442410 is a deficient number, since it is larger than the sum of its proper divisors (17233153946).

21541442410 is a wasteful number, since it uses less digits than its factorization.

21541442410 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2154144248.

The product of its (nonzero) digits is 5120, while the sum is 28.

Adding to 21541442410 its reverse (1424414512), we get a palindrome (22965856922).

The spelling of 21541442410 in words is "twenty-one billion, five hundred forty-one million, four hundred forty-two thousand, four hundred ten".