21101941 has 4 divisors (see below), whose sum is σ = 24116512. Its totient is φ = 18087372.

The previous prime is 21101933. The next prime is 21101963. The reversal of 21101941 is 14910112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21101941 - 2³ = 21101933 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21101341) 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, 1507275 + ... + 1507288.

It is an arithmetic number, because the mean of its divisors is an integer number (6029128).

Almost surely, 2^21101941 is an apocalyptic number.

It is an amenable number.

21101941 is a deficient number, since it is larger than the sum of its proper divisors (3014571).

21101941 is an equidigital number, since it uses as much as digits as its factorization.

21101941 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3014570.

The product of its (nonzero) digits is 72, while the sum is 19.

The square root of 21101941 is about 4593.6849043007. The cubic root of 21101941 is about 276.3381218018.

The spelling of 21101941 in words is "twenty-one million, one hundred one thousand, nine hundred forty-one".