22015021 has 8 divisors (see below), whose sum is σ = 25190784. Its totient is φ = 18846960.

The previous prime is 22015013. The next prime is 22015027. The reversal of 22015021 is 12051022.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 22015021 - 2³ = 22015013 is a prime.

It is a super-2 number, since 2×22015021² = 969322299260882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22014992 and 22015010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22015027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6936 + ... + 9598.

It is an arithmetic number, because the mean of its divisors is an integer number (3148848).

Almost surely, 2^22015021 is an apocalyptic number.

It is an amenable number.

22015021 is a deficient number, since it is larger than the sum of its proper divisors (3175763).

22015021 is a wasteful number, since it uses less digits than its factorization.

22015021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3851.

The product of its (nonzero) digits is 40, while the sum is 13.

The square root of 22015021 is about 4692.0167305755. The cubic root of 22015021 is about 280.2676904250.

Adding to 22015021 its reverse (12051022), we get a palindrome (34066043).

The spelling of 22015021 in words is "twenty-two million, fifteen thousand, twenty-one".