22121002 has 4 divisors (see below), whose sum is σ = 33181506. Its totient is φ = 11060500.

The previous prime is 22120957. The next prime is 22121003. The reversal of 22121002 is 20012122.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 22080601 + 40401 = 4699^2 + 201^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 22121002.

It is not an unprimeable number, because it can be changed into a prime (22121003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5530249 + ... + 5530252.

Almost surely, 2^22121002 is an apocalyptic number.

22121002 is a deficient number, since it is larger than the sum of its proper divisors (11060504).

22121002 is a wasteful number, since it uses less digits than its factorization.

22121002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11060503.

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

The square root of 22121002 is about 4703.2969287511. The cubic root of 22121002 is about 280.7167098068.

Adding to 22121002 its reverse (20012122), we get a palindrome (42133124).

The spelling of 22121002 in words is "twenty-two million, one hundred twenty-one thousand, two".