22012021 has 8 divisors (see below), whose sum is σ = 22293504. Its totient is φ = 21732480.

The previous prime is 22012019. The next prime is 22012031. The reversal of 22012021 is 12021022.

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 22012021 - 2¹ = 22012019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22011989 and 22012007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22012031) 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, 44586 + ... + 45076.

It is an arithmetic number, because the mean of its divisors is an integer number (2786688).

Almost surely, 2^22012021 is an apocalyptic number.

It is an amenable number.

22012021 is a deficient number, since it is larger than the sum of its proper divisors (281483).

22012021 is a wasteful number, since it uses less digits than its factorization.

22012021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 971.

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 22012021 is about 4691.6970277289. The cubic root of 22012021 is about 280.2549590984.

Adding to 22012021 its reverse (12021022), we get a palindrome (34033043).

Subtracting from 22012021 its reverse (12021022), we obtain a palindrome (9990999).

The spelling of 22012021 in words is "twenty-two million, twelve thousand, twenty-one".