22042451 has 4 divisors (see below), whose sum is σ = 23202600. Its totient is φ = 20882304.

The previous prime is 22042429. The next prime is 22042469. The reversal of 22042451 is 15424022.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15424022 = 2 ⋅7712011.

It is a cyclic number.

It is not a de Polignac number, because 22042451 - 2¹⁰ = 22041427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22042651) 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, 580046 + ... + 580083.

It is an arithmetic number, because the mean of its divisors is an integer number (5800650).

Almost surely, 2^22042451 is an apocalyptic number.

22042451 is a deficient number, since it is larger than the sum of its proper divisors (1160149).

22042451 is a wasteful number, since it uses less digits than its factorization.

22042451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1160148.

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 22042451 is about 4694.9388707416. The cubic root of 22042451 is about 280.3840435893.

Adding to 22042451 its reverse (15424022), we get a palindrome (37466473).

The spelling of 22042451 in words is "twenty-two million, forty-two thousand, four hundred fifty-one".