21367941 has 16 divisors (see below), whose sum is σ = 32784000. Its totient is φ = 12126528.

The previous prime is 21367933. The next prime is 21367979. The reversal of 21367941 is 14976312.

It is not a de Polignac number, because 21367941 - 2³ = 21367933 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21367901) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 286 + ... + 6543.

It is an arithmetic number, because the mean of its divisors is an integer number (2049000).

Almost surely, 2^21367941 is an apocalyptic number.

21367941 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21367941 is a deficient number, since it is larger than the sum of its proper divisors (11416059).

21367941 is a wasteful number, since it uses less digits than its factorization.

21367941 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6988.

The product of its digits is 9072, while the sum is 33.

The square root of 21367941 is about 4622.5470251799. The cubic root of 21367941 is about 277.4944013155.

The spelling of 21367941 in words is "twenty-one million, three hundred sixty-seven thousand, nine hundred forty-one".