22021040 has 20 divisors (see below), whose sum is σ = 51199104. Its totient is φ = 8808384.

The previous prime is 22021009. The next prime is 22021049. The reversal of 22021040 is 4012022.

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (22021049) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 137552 + ... + 137711.

Almost surely, 2^22021040 is an apocalyptic number.

22021040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22021040 is an abundant number, since it is smaller than the sum of its proper divisors (29178064).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

22021040 is a wasteful number, since it uses less digits than its factorization.

22021040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275276 (or 275270 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 11.

The square root of 22021040 is about 4692.6580953656. The cubic root of 22021040 is about 280.2932302222.

Adding to 22021040 its reverse (4012022), we get a palindrome (26033062).

The spelling of 22021040 in words is "twenty-two million, twenty-one thousand, forty".