21760949 has 8 divisors (see below), whose sum is σ = 25377600. Its totient is φ = 18651948.

The previous prime is 21760931. The next prime is 21760951. The reversal of 21760949 is 94906712.

It is a de Polignac number, because none of the positive numbers 2^k-21760949 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21760549) 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, 31379 + ... + 32064.

It is an arithmetic number, because the mean of its divisors is an integer number (3172200).

Almost surely, 2^21760949 is an apocalyptic number.

It is an amenable number.

21760949 is a deficient number, since it is larger than the sum of its proper divisors (3616651).

21760949 is an frugal number, since it uses more digits than its factorization.

21760949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63464 (or 63450 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 21760949 is about 4664.8632348655. The cubic root of 21760949 is about 279.1853403810.

The spelling of 21760949 in words is "twenty-one million, seven hundred sixty thousand, nine hundred forty-nine".