21241019 has 8 divisors (see below), whose sum is σ = 21537792. Its totient is φ = 20946600.

The previous prime is 21241013. The next prime is 21241037. The reversal of 21241019 is 91014212.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21241019 is a prime.

It is a super-2 number, since 2×21241019² = 902361776316722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21241013) 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, 24182 + ... + 25044.

It is an arithmetic number, because the mean of its divisors is an integer number (2692224).

Almost surely, 2^21241019 is an apocalyptic number.

21241019 is a deficient number, since it is larger than the sum of its proper divisors (296773).

21241019 is a wasteful number, since it uses less digits than its factorization.

21241019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1177.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 21241019 is about 4608.7979994788. The cubic root of 21241019 is about 276.9438864209.

The spelling of 21241019 in words is "twenty-one million, two hundred forty-one thousand, nineteen".