21761072 has 10 divisors (see below), whose sum is σ = 42162108. Its totient is φ = 10880528.

The previous prime is 21761041. The next prime is 21761083. The reversal of 21761072 is 27016712.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 680018 + ... + 680049.

Almost surely, 2^21761072 is an apocalyptic number.

It is an amenable number.

21761072 is a deficient number, since it is larger than the sum of its proper divisors (20401036).

21761072 is a wasteful number, since it uses less digits than its factorization.

21761072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1360075 (or 1360069 counting only the distinct ones).

The product of its (nonzero) digits is 1176, while the sum is 26.

The square root of 21761072 is about 4664.8764185131. The cubic root of 21761072 is about 279.1858663957.

Adding to 21761072 its reverse (27016712), we get a palindrome (48777784).

The spelling of 21761072 in words is "twenty-one million, seven hundred sixty-one thousand, seventy-two".