22012724 has 6 divisors (see below), whose sum is σ = 38522274. Its totient is φ = 11006360.

The previous prime is 22012717. The next prime is 22012733. The reversal of 22012724 is 42721022.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 20976400 + 1036324 = 4580^2 + 1018^2 .

It is a junction number, because it is equal to n+sod(n) for n = 22012696 and 22012705.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2751587 + ... + 2751594.

It is an arithmetic number, because the mean of its divisors is an integer number (6420379).

Almost surely, 2^22012724 is an apocalyptic number.

It is an amenable number.

22012724 is a deficient number, since it is larger than the sum of its proper divisors (16509550).

22012724 is a wasteful number, since it uses less digits than its factorization.

22012724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5503185 (or 5503183 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 20.

The square root of 22012724 is about 4691.7719467169. The cubic root of 22012724 is about 280.2579425764.

Adding to 22012724 its reverse (42721022), we get a palindrome (64733746).

It can be divided in two parts, 2201272 and 4, that multiplied together give a palindrome (8805088).

The spelling of 22012724 in words is "twenty-two million, twelve thousand, seven hundred twenty-four".