22012642 has 4 divisors (see below), whose sum is σ = 33018966. Its totient is φ = 11006320.

The previous prime is 22012631. The next prime is 22012657. The reversal of 22012642 is 24621022.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24621022 = 2 ⋅12310511.

It can be written as a sum of positive squares in only one way, i.e., 21986721 + 25921 = 4689^2 + 161^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5503159 + ... + 5503162.

Almost surely, 2^22012642 is an apocalyptic number.

22012642 is a deficient number, since it is larger than the sum of its proper divisors (11006324).

22012642 is a wasteful number, since it uses less digits than its factorization.

22012642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11006323.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 22012642 is about 4691.7632080061. The cubic root of 22012642 is about 280.2575945780.

Adding to 22012642 its reverse (24621022), we get a palindrome (46633664).

The spelling of 22012642 in words is "twenty-two million, twelve thousand, six hundred forty-two".