21740811 has 8 divisors (see below), whose sum is σ = 29080464. Its totient is φ = 14447520.

The previous prime is 21740801. The next prime is 21740833. The reversal of 21740811 is 11804712.

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

It is not a de Polignac number, because 21740811 - 2⁷ = 21740683 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21740801) 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, 10480 + ... + 12381.

It is an arithmetic number, because the mean of its divisors is an integer number (3635058).

Almost surely, 2^21740811 is an apocalyptic number.

21740811 is a deficient number, since it is larger than the sum of its proper divisors (7339653).

21740811 is a wasteful number, since it uses less digits than its factorization.

21740811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23181.

The product of its (nonzero) digits is 448, while the sum is 24.

The square root of 21740811 is about 4662.7042582604. The cubic root of 21740811 is about 279.0991926433.

The spelling of 21740811 in words is "twenty-one million, seven hundred forty thousand, eight hundred eleven".