21141601 has 4 divisors (see below), whose sum is σ = 22767892. Its totient is φ = 19515312.

The previous prime is 21141581. The next prime is 21141607. The reversal of 21141601 is 10614112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8856576 + 12285025 = 2976^2 + 3505^2 .

It is a cyclic number.

It is not a de Polignac number, because 21141601 - 2⁵ = 21141569 is a prime.

It is a super-3 number, since 3×21141601³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21141607) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 813126 + ... + 813151.

It is an arithmetic number, because the mean of its divisors is an integer number (5691973).

Almost surely, 2^21141601 is an apocalyptic number.

It is an amenable number.

21141601 is a deficient number, since it is larger than the sum of its proper divisors (1626291).

21141601 is a wasteful number, since it uses less digits than its factorization.

21141601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1626290.

The product of its (nonzero) digits is 48, while the sum is 16.

The square root of 21141601 is about 4597.9996737712. Note that the first 3 decimals coincide. The cubic root of 21141601 is about 276.5111344975.

Adding to 21141601 its reverse (10614112), we get a palindrome (31755713).

The spelling of 21141601 in words is "twenty-one million, one hundred forty-one thousand, six hundred one".