22121716 has 6 divisors (see below), whose sum is σ = 38713010. Its totient is φ = 11060856.

The previous prime is 22121713. The next prime is 22121717. The reversal of 22121716 is 61712122.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 13395600 + 8726116 = 3660^2 + 2954^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22121713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2765211 + ... + 2765218.

Almost surely, 2^22121716 is an apocalyptic number.

It is an amenable number.

22121716 is a deficient number, since it is larger than the sum of its proper divisors (16591294).

22121716 is a wasteful number, since it uses less digits than its factorization.

22121716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5530433 (or 5530431 counting only the distinct ones).

The product of its digits is 336, while the sum is 22.

The square root of 22121716 is about 4703.3728323406. The cubic root of 22121716 is about 280.7197300072.

Adding to 22121716 its reverse (61712122), we get a palindrome (83833838).

The spelling of 22121716 in words is "twenty-two million, one hundred twenty-one thousand, seven hundred sixteen".