22021002 has 24 divisors (see below), whose sum is σ = 47834436. Its totient is φ = 7321536.

The previous prime is 22020991. The next prime is 22021007. The reversal of 22021002 is 20012022.

It can be written as a sum of positive squares in 2 ways, for example, as 21706281 + 314721 = 4659^2 + 561^2 .

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (22021007) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6888 + ... + 9564.

Almost surely, 2^22021002 is an apocalyptic number.

22021002 is an abundant number, since it is smaller than the sum of its proper divisors (25813434).

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

22021002 is a wasteful number, since it uses less digits than its factorization.

22021002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3142 (or 3139 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 9.

The square root of 22021002 is about 4692.6540464858. The cubic root of 22021002 is about 280.2930689953.

Adding to 22021002 its reverse (20012022), we get a palindrome (42033024).

The spelling of 22021002 in words is "twenty-two million, twenty-one thousand, two".