21622072 has 8 divisors (see below), whose sum is σ = 40541400. Its totient is φ = 10811032.

The previous prime is 21622061. The next prime is 21622099. The reversal of 21622072 is 27022612.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1351372 + ... + 1351387.

It is an arithmetic number, because the mean of its divisors is an integer number (5067675).

Almost surely, 2^21622072 is an apocalyptic number.

It is an amenable number.

21622072 is a deficient number, since it is larger than the sum of its proper divisors (18919328).

21622072 is a wasteful number, since it uses less digits than its factorization.

21622072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2702765 (or 2702761 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 21622072 is about 4649.9539782669. The cubic root of 21622072 is about 278.5901580469.

Adding to 21622072 its reverse (27022612), we get a palindrome (48644684).

The spelling of 21622072 in words is "twenty-one million, six hundred twenty-two thousand, seventy-two".