22073721 has 16 divisors (see below), whose sum is σ = 30865536. Its totient is φ = 14005376.

The previous prime is 22073713. The next prime is 22073731. The reversal of 22073721 is 12737022.

It is a cyclic number.

It is not a de Polignac number, because 22073721 - 2³ = 22073713 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22073691 and 22073700.

It is not an unprimeable number, because it can be changed into a prime (22073731) 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, 15391 + ... + 16763.

It is an arithmetic number, because the mean of its divisors is an integer number (1929096).

Almost surely, 2^22073721 is an apocalyptic number.

It is an amenable number.

22073721 is a deficient number, since it is larger than the sum of its proper divisors (8791815).

22073721 is a wasteful number, since it uses less digits than its factorization.

22073721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1632.

The product of its (nonzero) digits is 1176, while the sum is 24.

The square root of 22073721 is about 4698.2678723121. The cubic root of 22073721 is about 280.5165676648.

The spelling of 22073721 in words is "twenty-two million, seventy-three thousand, seven hundred twenty-one".