21041421005 has 8 divisors (see below), whose sum is σ = 27545133024. Its totient is φ = 15302851600.

The previous prime is 21041420977. The next prime is 21041421007. The reversal of 21041421005 is 50012414012.

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 21041421005 - 2⁶ = 21041420941 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21041421007) 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, 191285591 + ... + 191285700.

It is an arithmetic number, because the mean of its divisors is an integer number (3443141628).

Almost surely, 2^21041421005 is an apocalyptic number.

It is an amenable number.

21041421005 is a deficient number, since it is larger than the sum of its proper divisors (6503712019).

21041421005 is a wasteful number, since it uses less digits than its factorization.

21041421005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 382571307.

The product of its (nonzero) digits is 320, while the sum is 20.

Adding to 21041421005 its reverse (50012414012), we get a palindrome (71053835017).

The spelling of 21041421005 in words is "twenty-one billion, forty-one million, four hundred twenty-one thousand, five".